While it is generally understood that Alzheimer’s disease (AD) and related dementias (ADRD) is one of the costliest diseases to society, there is widespread concern that researchers and policymakers are not comprehensively capturing and describing the full scope and magnitude of the socioeconomic burden of ADRD. This review aimed to 1) catalogue the different types of AD-related socioeconomic costs described in the literature; 2) assess the challenges and gaps of existing approaches to measuring these costs; and 3) analyze and discuss the implications for stakeholders including policymakers, healthcare systems, associations, advocacy groups, clinicians, and researchers looking to improve the ability to generate reliable data that can guide evidence-based decision making. A centrally emergent theme from this review is that it is challenging to gauge the true value of policies, programs, or interventions in the ADRD arena given the long-term, progressive nature of the disease, its insidious socioeconomic impact beyond the patient and the formal healthcare system, and the complexities and current deficiencies (in measures and real-world data) in accurately calculating the full costs to society. There is therefore an urgent need for all stakeholders to establish a common understanding of the challenges in evaluating the full cost of ADRD and define approaches that allow us to measure these costs more accurately, with a view to prioritizing evidence-based solutions to mitigate this looming public health crisis.
Alzheimer’s disease (AD) and related dementias (ADRD) are a major cause of disability and dependency among older adults worldwide , having a significant impact not only on individuals but also on their families, communities, and societies. In 2015, dementia costs were estimated at US$818 billion, equivalent to 1.1% of global gross domestic product—a staggering cost that had grown by 35% since 2010. By 2030, it is estimated that the global cost of dementia could grow to US$2 trillion, which could overwhelm health and social care systems .
While it is generally acknowledged that ADRD is one of the costliest diseases to society [3, 4], the burden is complex and has been difficult to assess accurately due to myriad factors [2, 4, 5]. As patients require the support of multiple stakeholders across the healthcare and social care sectors, as well as from family members and friends, the cost of care is not neatly captured by typical healthcare delivery systems. The impact on the quality of life of both patients and their caregivers  is not readily translated into monetary costs. While our understanding of the mechanisms of AD and related neurodegenerative diseases, co-morbidities, and aging processes, that often combine to lead to cognitive or behavioral decline, clinical symptoms and cognitive impairment and dementia (CID), is expanding, it still remains limited . This limited understanding, combined with the practical challenges that result in low rates of detection, diagnosis, disclosure, and care  in patients with ADRD until the middle and later stages of CID, results in a potentially significant, but grievously understudied, ‘hidden’ cost associated with early ADRD. Moreover, considerable heterogeneity exists across cost of illness studies with respect to the nature of the populations studied, terminologies and the methods used [5, 8–11].
Concerns have recently been raised that researchers and policymakers are not comprehensively capturing and describing the full scope and magnitude of the socioeconomic burden of ADRD and that additional research is needed to better capture the value of care and costs of ADRD [5, 6]. In the U.S., there also appears to be significant gender and racial/ethnic disparities in prevalence, access, and costs related to CID, with costs and care burden being much higher in women and minorities, particularly Blacks/African American [6, 12]. From a public policy perspective, accurately assessing the socioeconomic costs of ADRD is critical to prioritizing effective, evidence-based policies, and intervention and implementation strategies, particularly given the potential arrival of high-cost interventions, such as disease-modifying therapies, whose cost-effectiveness may be difficult to ascertain by conventional methods. Several reports have recently discussed the challenges and limitations in assessing the full costs of ADRD, with varying degrees of scope and comprehensiveness [5, 13, 14].
This review aimed to 1) catalogue the different types of ADRD-related socioeconomic costs described in the literature; 2) assess the challenges and gaps of existing approaches to measuring these costs; and, 3) analyze and discuss the implications for stakeholders including policymakers, healthcare systems, associations, advocacy groups, clinicians and researchers looking to improve our ability to generate reliable data that can guide evidence-based decision making.
Please see Table 1 for a glossary of abbreviations used in this review. As many of the reports cited in this review did not explicitly separate individuals with AD from patients with other causes of CID (e.g., vascular cognitive impairment and dementia, dementia with Lewy bodies, frontotemporal dementias), and with the recognition that the sporadic AD phenotype in older individuals is often due to mixed pathologies that include AD (e.g., AD+vascular-ischemic brain injury pathologies; AD+Lewy body pathologies) [15–18] the term ‘Alzheimer’s and related dementias (ADRD)’, as employed in other reviews, was used when presenting and discussing the costs of diseases . The terms ‘Alzheimer’s’ or ‘AD’ were used when the data or discussion is relevant only to AD; for example, when discussing diagnostic criteria and biomarkers .
|Alzheimer’s Disease (AD)|
|Alzheimer’s Disease and Related Dementias (ADRD)|
|Cognitive Impairment and Dementia (CID)|
|Dementia Quality of Life (DEMQOL)|
|Emergency Department (ED)|
|EuroQol Five-Dimension Questionnaire (EQ-5D)|
|Health-Related Quality of Life (HRQOL)|
|Mild Cognitive Impairment (MCI)|
|Out of Pocket (OOP)|
|Quality of Life (QOL)|
|Quality of Life in Alzheimer’s Disease (QOL-AD)|
|Quality-Adjusted Life Year (QALY)|
|Resource Utilization in Dementia (RUD)|
|Zarit Burden Interview (ZBI)|
Direct costs have been described as goods and services for which money is explicitly exchanged . In the context of ADRD, this is generally considered to include medical and social/non-medical care costs for patients related to their illness [8, 21–28]. While the classification of medical and social care costs can vary across countries, direct medical costs typically include elements such as medical practitioner/allied health professional visits, hospital care, medical treatments/medications, and specialized aids and equipment. Social care and non-medical costs could include elements such as community and social services (e.g., transportation, peer support, and psychosocial interventions), private and publicly funded home care, special accommodations (e.g., nursing homes), patient income and welfare support, and household expenses (e.g., home modifications). While it is recognized that caregivers can exhibit an array of health issues (e.g., depression, weakened immune system, and cardiovascular problems) associated with the stresses of caring for patients with ADRD [29–32], there is a lack of consensus in the literature on how to categorize the direct costs associated with caring for the caregiver. In this review, both patient- and caregiver-related costs for which money is explicitly exchanged are included under the category of “Direct Costs”. Please see Box 1 for a summary of key findings from this section.
• Direct costs in ADRD include both medical (e.g., medication, hospitalization) and social/non-medical (e.g., residential care) costs for patients and caregivers.
• These costs have been measured using administrative data sets (e.g., insurance claims) or standardized questionnaires (e.g., Resource Utilization in Dementia Questionnaire) that quantify self-reported resource use.
• Several challenges have been noted in measuring direct costs in ADRD. For example, medical insurance claims may not capture the full direct costs of ADRD, such as household out-of-pocket expenditures or the costs borne by other insurers; moreover, self-reported resource use is subjective and difficult to standardize.
• Despite these methodological challenges, several studies have shown that the direct patient costs of AD are substantial and increase over time or with disease severity; notably, direct costs may begin to accrue several years prior to a dementia diagnosis.
Patients and caregivers: Measurement of direct costs
Direct medical and social/non-medical costs have generally been measured using two approaches. Several studies have relied on administrative data drawn from centralized databases such as insurance claims data or patient registries . Others have employed surveys or standardized questionnaires administered to patients and their caregivers to measure self-reported resource utilization for patients and caregivers (e.g., living accommodation, hospitalizations, community care services); healthcare costs are then estimated by multiplying unit costs of services and products by recorded resource use . Several instruments have been used to gather resource use data, including Resource Utilization in Dementia (RUD), Client Service Receipt Inventory, Resource Use Inventory, cost diary, and informal care survey [33, 34]. The RUD, and its short version, the RUD Lite, are among the most, if not the most, commonly used instrument for collecting resource use data in ADRD . The RUD was designed, over 20 years ago, to be useful in different care settings, across different countries and care systems, and provides an informant-reported estimate of caregiving time and related activities; support services received by the patient (e.g., day care, meals on wheels, in-home care), medications, and medical/health-related visits (e.g., number of visits to general practitioner or physiotherapist, emergency department [ED] and hospitalizations). While numbers of visits to the ED and nights spent in hospital in different wards are reported by the informant and are counted in “units” of utilization to be multiplied by a generic (mean) unit costs per service, lack of verification of number, nature, and extent of each service utilized represents a major limitation in extrapolation of the actual costs incurred.
Several additional challenges have been noted in measuring direct costs in ADRD. In general, ADRD, particularly early in its course, has been under- or misdiagnosed or underreported , which could lead to the under- or overestimation of costs across studies [35–37]. Additionally, many studies have applied variable and specific inclusion criteria (e.g., availability of an informal caregiver, enrolled in memory clinics), which can potentially introduce selection bias and challenges the validity of extrapolating results to the general ADRD population [25, 26, 38]. Moreover, most patients in the dementia stages of ADRD are elderly and typically suffer from comorbidities, such as cerebrovascular disease, albeit at a higher rate compared to individuals without ADRD [39, 40]. Most reports, however, do not distinguish direct costs that are a consequence of ADRD symptoms from direct costs attributable to comorbidities. Similarly, it has been challenging to ascribe caregiver direct costs as a specific and unique consequence of caregiving for an ADRD patient .
From a methodological standpoint, studies based on medical insurance claims data may not capture the full direct costs of ADRD, such as out-of-pocket expenses (e.g., co-payments) borne by patients and caregivers or the costs to other insurers (e.g., pension insurance paying for rehabilitation services) [14, 38]. While studies relying on surveys and questionnaires may capture a broader range of costs, these are based on self-reported measures and might be subject to inaccuracies [14, 26]. For example, it has been shown that survey estimates tend to underestimate healthcare utilization in the elderly population , and this effect could be hypothesized to be even potentially greater due to impairments in awareness, insight, memory and cognition in individuals with ADRD.
Direct costs for patients begin to mount before a diagnosis of ADRD
Using records from the Danish National Patient Registry, increased healthcare costs were identified in patients as early as 10 years prior to a diagnosis of ADRD . Importantly, partners of patients exhibited statistically significant increases in healthcare costs up to 2 years prior to diagnosis. Similarly, other studies have found that healthcare costs increase in both ADRD [42–44] and mild cognitive impairment (MCI)  patients up to one-year prior to diagnosis . For example, Medicare expenditures were 42% and 41% higher in ADRD and MCI patients, respectively, compared to matched controls one year prior to diagnosis. The propensity of evidence supports that individuals with undiagnosed ADRD account for higher direct costs in the years leading up to the ultimate recognition and diagnosis of their cognitive impairment/dementia. The driver of these costs relates to consequences of unrecognized or unmanaged cognitive and behavioral impairments and vulnerabilities in individuals with undiagnosed ADRD that could include: 1) exacerbation of co-morbid conditions due to the patient’s inability to properly manage their medical conditions (that can lead to additional unnecessary testing, medications, procedures, ED visits and hospitalizations); 2) diagnostic testing, medications, or procedures for vague or unrecognized dementia-associated symptoms (e.g., depression, hearing loss, GI symptoms, dizziness, anxiety, and sleep disturbances); 3) injuries such as falls, motor vehicle accidents, and accidents in the home precipitated by lack of planning, foresight, insight, judgment, or cognitive abilities; and 4) delirium , a major driver for ED visits and hospitalizations, as well as in-hospital or post-operative complication and morbidity.
Direct costs generally increase over time, driven primarily by social care costs
Several longitudinal studies have shown that the direct patient costs of AD increase over time or with disease severity [24, 25, 27, 46] and are higher in nursing home residents, compared to community-dwelling patients [26, 47]. In community-dwelling patients, the main driver appears to be patient social care costs [24, 25], while direct medical costs for patients and for caregivers do not differ according to ADRD severity [24, 25, 46].
Out-of-pocket expenditures borne by ADRD patients are high, exceed those of individuals without ADRD, and are disproportionately borne by women and minorities
Only a few studies, primarily based on US populations, have conducted detailed analyses of out-of-pocket expenditures in ADRD patients and caregivers and the subsequent burden placed on households and families . For example, in a study of Medicare beneficiaries in the US, out-of-pocket (OOP) expenditures were higher in patients with ADRD. Moreover, another study of Medicare beneficiaries examined OOP spending during the last 5 years of life and found that OOP spending for patients with dementia represented 32% of household wealth compared to 11% for individuals without ADRD. Moreover, the proportion of spending was higher for African Americans, unmarried/widowed women, and those with less than high school education . Similarly, out-of-pocket spending in caregivers of patients with ADRD is approximately twice as high as those for caregivers of individuals without ADRD . The Alzheimer’s Association has estimated that OOP costs in 2018 could reach US$60 billion, or approximately 22% of the total costs of the disease .
Indirect costs have generally been defined as a “resource lost or invested for which no money is exchanged” . As noted by Alzheimer’s Disease International [9, 50], there are two main sources of indirect costs in ADRD. These include the costs of informal care, arising from the unpaid inputs or the productivity losses of informal caregivers, such as families, friends, and others. In the U.S., it is estimated that annually 18.5 billion hours of informal care are provided by caregivers to individuals with ADRD that translates to a contribution valuation of US$234 billion per year . Indirect costs may also arise from productivity losses in patients due to work impairment, sick leave, early retirement, or mortality. The estimated total lifetime cost of providing care for an individual with dementia was US$350,174 in 2018 dollars and the costs associated with family care make up 70% of lifetime dementia care costs [6, 51]. Furthermore, these estimates likely underestimate the full impact of family caregivers’ health and workplace productivity [6, 14]. Please see Box 2 for a summary of key findings from this section.
• The main driver of indirect costs of ADRD is the unpaid work of informal caregivers, such as families and friends.
• The two most common approaches to quantifying the cost of informal care rely on estimates of the time caregivers spend in the provision of care. The ‘replacement cost’ approach values informal care time using the cost of an equivalent service bought in the market, while the ‘opportunity cost (or human capital)’ approach values informal care time by estimating the loss of labor market income.
• There is no unified consensus in the literature on the most appropriate approaches to estimate indirect costs in ADRD, and the choice of method and assumptions used can lead to striking variability in cost estimates.
• Notwithstanding the variabilities in informal care cost estimates, several studies have demonstrated a direct association between costs and disease severity; interestingly, there is evidence that the indirect costs of ADRD may also be elevated many years prior to a diagnosis of dementia.
• Emerging evidence suggests that informal caregivers may be forced to cut back on savings and expenditures, thereby threatening the financial security of households. This may be further exacerbated by the fact that many households will already be operating on fixed retirement incomes.
Caregivers: Informal care costs
The impact of ADRD on informal caregiver productivity has been assessed through various approaches, including semi-quantitative surveys and structured questionnaires aimed at caregivers. For example, surveys conducted by Carers UK and Employers for Carers  and the Alzheimer’s Association  have asked series of questions on employment challenges. In other studies, impairments have been assessed by quantifying employment absenteeism and presenteeism [54, 55]. For instance, productivity impairments were assessed using the Work Productivity and Activity Impairment questionnaire in the Japan National Health and Wellness Surveys. While these types of studies do provide insights into the employment challenges faced by informal caregivers, they do not explicitly quantify or value the associated costs.
Most reports that have quantified the cost of informal care rely on estimates of the time caregivers spend in the provision of care. For instance, several population-based studies, such as GERAS observational study in France, Germany, and the UK, and the European RightTimePlaceCare prospective cohort study, have relied on the RUD questionnaire (see ‘Direct Costs’, above). This instrument assesses the time caregivers spend on the provision of informal care such as Activities of Daily Living and Instrumental Activities of Daily Living, while also asking employed informal caregivers to state whether they had reduced their work hours and to what degree.
Questionnaires such as the RUD and the RUD-Lite form the foundation of two common approaches to quantifying the value of informal care costs; namely, the replacement cost approach [48, 56] and the opportunity cost approach (also referred to as the forgone wages or human capital approach) [21, 57–59]. The replacement cost approach values informal care time using the cost of an equivalent service bought in the market, such as the cost of a formal (paid) caregiver. The opportunity cost approach values informal care time by estimating the loss of labor market income using the caregiver’s expected market wage, such as a national average wage.
The valuation (or costing) of informal care using these approaches, however, is challenging in practice [9, 50]. For example, it is often difficult to delimit time spent by caregivers on different caregiving tasks, such as basic supervision or support with activities of daily living, which are self-reported and can occasionally erroneously exceed 24 hours per day in totality. A second major issue in the use of the opportunity cost approach is determining the most appropriate alternative use of the caregiver’s time. While this is less of a challenge for employed caregivers, where the alternative is paid work, the valuation of time spent by unemployed or retired caregivers is not straightforward and different strategies have been adopted. For example, several studies segregate informal caregivers by employment status, and have reduced the opportunity cost of time for unemployed or retired caregivers to about 25-35% of average labor force wages, commonly referred to as the value of ‘leisure time’ [23–25, 58]. In another study, unpaid ‘leisure time’ in retired carers was valued based on average pension rates . Another method has been to scale down the labor force wage rate by multiplying it by the rate of labor force participation in the same demographic group . Another challenge, seldom discussed, is estimating the incremental or differential costs to caregivers based on their sex or relationship to the patient. For example, the majority, approximately two-thirds, of informal caregivers are women [6, 62–64], and a disproportionate burden of caregiving has been demonstrated to fall on wives and daughters compared to husbands and sons [65, 66]. The additional time that women invest in caring for someone with dementia is thought to contribute to higher levels of impaired mood, depression, and impaired health compared to men .
Informal care has also been valued using at least two other approaches, albeit less commonly than the methods described above. The contingent valuation approach [8, 20, 26, 67, 68] is rooted in welfare economics and presents subjects with a hypothetical market situation to obtain their monetary valuation of a hypothetical change. In the case of ADRD, this method consists in valuing informal care using a ‘price’ the caregiver would be willing to pay to reduce caregiving time by one hour, or, alternatively, a willingness to accept a ‘payment’ to provide an additional hour of care. It has been suggested that such approaches can overcome the challenges associated with the valuation of leisure time described above and bring the added benefit of incorporating caregivers’ preferences . Finally, using a more direct approach, one study relying on records from the Danish National Patient Registry examined productivity losses in both patients (see below) and their partners, defined as an adult cohabitee, irrespective of gender. This approach is possible in Denmark as labor market income is registered in central databases that include all citizens.
Ultimately, the choice of method and assumptions used to value informal care can lead to striking variability in cost estimates. For example, using the same cohort of patients, annual informal caregiving was valued at US$13,188 using the replacement costs approach but was valued at US$27,789 using the opportunity cost approach . Similarly, a study from Sweden found that informal costs can range from SEK 60 billion to SEK 124 billion depending on the approach used . A systematic review conducted by ADI indicated that the proportion of total disease costs attributed to informal care ranged from 19% to 91% across studies, largely due to differences in the assumptions and approaches used to assess and value informal care . ADI favors the use of the opportunity cost method [9, 50, 70], and while no clear consensus has emerged in the published literature, several reports have prudently presented results using multiple approaches, typically as part of sensitivity analyses [8, 25, 26, 46, 47, 59, 61, 71–74].
Patients: Productivity losses
It has been noted that productivity losses in patients are generally less relevant in the context of ADRD, since most of those affected are older people who would in most cases be retired [50, 75]. Nonetheless, productivity losses in patients have been assessed in several studies. However, it is challenging to conclusively assess the scale of productivity losses given the sensitivity of cost estimates on the approaches used. For example, in a comprehensive cost of illness study of moderate to severe dementia patients in fifteen European Union member states, productivity losses, including mortality and morbidity losses, accounted for only € 2.2 billion (1%) of total costs. In this study, morbidity losses were adjusted for the “friction period”, a 90-day period of employee’s absence from work due to illness before he or she is replaced by another worker. However, if morbidity losses were calculated using a human capital approach, productivity losses rose dramatically to € 7.3 billion.
Productivity losses are also challenging to assess and compare across different studies due to several potential confounding factors such as differences in stages of illness in the populations examined, country-specific differences in labor marker wages or differences in the methods used in calculating costs. For example, one study estimated productivity losses due to premature mortality from AD based on US death certificates from 1999 to 2010 . Using a human capital approach, the cost due to premature mortality was $4.4 billion (2010 US dollars) over the period 1999 to 2010 . While non-trivial, this pales in comparison to the total cost of ADRD, which has been estimated at US$259 billion in the US in 2016 alone . Another report using registry data from the Swedish Social Insurance Agency estimated productivity losses in individuals who were prematurely retired or on sick leave due to a dementia diagnosis . At SEK118 million (2012), the productivity losses due to premature retirement or sick leave in Sweden represented only a minor component of total costs. A Danish study examined productivity losses in 78,715 patients and 312,813 matched controls up to 10 years prior to diagnosis . In contrast to the above-mentioned studies, productivity losses due to forgone wages in patients comprised 18% to 36% of total per patient costs (Percentages are based on our calculations using the authors’ reported raw costs. In that study total costs were defined as the sum outpatient and inpatient costs, medication, public health Insurance, and indirect costs such as foregone earnings) .
The indirect costs of ADRD, in both patients and caregivers, become increasingly elevated years prior to a diagnosis of dementia
For example, in a Danish Study , employment rates and income from employment were lower in patients than in matched controls up to 10 years before diagnosis. Strikingly, partners of patients also had a lower employment rate and income than those in their control group, but this difference diminished after diagnosis.
Informal costs of caring for community-dwelling ADRD patients increase with disease severity
Most studies have assessed informal care costs as a consequence of caring for a patient diagnosed with dementia. Many studies of community-based patients have further segregated individuals according disease severity (e.g., mild, moderate, severe), typically based on measures such as Mini–Mental State Examination criteria or the Clinical Dementia Rating [8, 25, 56, 57, 59, 60, 71, 72, 74, 78, 79]. Despite the variabilities in informal care cost estimates, several cross-sectional and longitudinal studies have demonstrated a direct association between costs and disease severity [25, 57, 59, 60, 78]. For instance, a longitudinal study using the population-based community cohort with dementia from the Cache County Study found that informal costs increased by approximately 18% per year, and that compared to very mild dementia, informal costs increased over 2-fold for mild, 5-fold for moderate and 6-fold for severe dementia [57, 80].
The total financial impact of ADRD on households and the economy is substantial
A recent survey by the Alzheimer’s Association found that many informal caregivers were forced to cut back on expenditures on themselves and their families to support a relative or friend with ADRD. Notably, 20% of informal caregivers, including 45% of spouses/partners and 17% of children, reported having to spend money from their own retirement savings . Reduced savings can impact the financial security not only of informal caregivers, but potentially also of their children and succeeding generations. Moreover, patients with MCI and dementia exhibit impairments in financial abilities and decision-making [81, 82], leading to increased vulnerability to financial exploitation and abuse, which is commonly associated with diminished or impaired mental capacities . For example, True Link Financial, a financial-services firm, estimated annual losses in the US from financial abuse of the elderly at US$36.48 billion each year, of which US$16.99 billion is lost due to financial exploitation specifically designed to take advantage of older Americans . Most approaches to value informal care, such as the opportunity or replacement cost methods, or productivity losses in patients, may not fully capture the financial burden on households such as reduced savings and therefore underestimate the indirect costs of the disease.
Intangible costs are non-material costs which are not typically covered in economic analyses since they are better expressed in qualitative terms and do not easily lend themselves to monetization. Intangible costs apply to both patients and caregivers and stem from the deterioration of social, psychological, and physical domains of quality of life (QOL) (e.g., pain and suffering, impact on activities, use of time, personal relationships, and family) and/or exacerbation of comorbid illnesses. The economic translation of intangible costs is generally absent from studies that estimate the socioeconomic burden of ADRD .
Patients: Quality of life and quality-adjusted life years
Predominately two related methodologies have been used to evaluate the intangible costs for ADRD patients: namely, qualitative assessment of QOL through various scales and questionnaires and the quality-adjusted life year (QALY) concept.
At least 15 different instruments have been used to evaluate various domains of QOL or health-related quality of life (HRQOL) in ADRD patients [33, 85, 86]. QOL has been assessed with generic instruments, such as the EuroQol five-dimension questionnaire (EQ-5D) and 36-item Short-Form, as well dementia-specific instruments, such as the Quality of Life in Alzheimer’s Disease (QOL-AD) and Dementia Quality of Life questionnaire (DEMQOL). Both the QOL-AD and DEMQOL have been shown to be reliable and valid in patients with mild to moderate dementia and have been recommended as instruments of choice to assess QOL in clinical trials [33, 85]. QOL measures can also be combined with AD-specific measures of symptoms, mental and/or physical functioning as well as determination of co-morbid illness to provide a more holistic view of wellbeing and quality of life [55, 87]. Comorbidities are generally captured and rated using electronic health record data and/or questionnaires (e.g., Charlson comorbidity index).
However, there are several practical challenges that confound a comprehensive understanding of QOL in patients with ADRD [85, 88]. For instance, ADRD patients themselves may be unaware of the disease or its impact, and often exhibit reduced insight or ability to consistently assess wellbeing and QOL as cognitive function declines; moreover, the agreement between patient self-reported and caregiver proxy measures varies across studies . Such confounding factors may contribute to the significant variability in reported QOL measures both within and across studies. For example, in one multi-center, longitudinal study in the UK, approximately equal proportions of patients reported declines or maintenance/improvements in QOL measures, with no significant group level changes over 18 months . In contrast, group proxy ratings changed but depended on the instrument used; for example, EQ-5D proxy data suggested an overall decline, while DEMQOL proxy data indicated an overall increase, in quality of life. Establishing a clear relationship between QOL and disease severity has also been challenging . For example, some studies have shown that QOL declines for patients as the disease progresses [89–92], while others have found no clear or consistent relationships between QOL measures and disease severity [88, 93–95]. Please see Box 3 for a summary of key findings from this section.
• Intangible costs in patients and caregivers have primarily been assessed using instruments that evaluate QOL in patients and caregivers; QALYs are commonly used in cost-effectiveness (or cost-utility) studies.
• Variability in the directionality of QOL changes both within and across studies has been noted. For example, some studies have shown that QOL declines for patients as the disease progresses, while others have found no clear or consistent relationship. Similarly, caregivers can experience both a rise or decline in QOL in response to caring for a person with ADRD.
• Challenges in quantifying the impact of ADRD on QOL may have important implications for the allocation of resources or reimbursement decisions. For example, different methodologies used to calculate QALYs may lead to contrasting results with respect to the cost-effectiveness of health interventions.
• Methodological limitations aside, several studies have shown a strong correlation between caregiving and health status of the caregiver; moreover, the subjective burden experienced by informal caregivers generally increases with disease severity.
• Notably, both QOL and caregiver burden may be impacted several years before the onset of dementia.
The challenges in assessing QOL in ADRD may have important implications for the allocation of resources or reimbursement decisions, since the impact of interventions on QOL are increasingly being adopted in health technology assessments in several countries (e.g., UK, Canada, Sweden, Germany) [86, 96]. One specific metric that is commonly used in cost-effectiveness (or cost-utility) studies is the QALY [96, 97], which aims to combine mortality and morbidity into a single measurement. QALYs aim to quantify the impact of an intervention on both length of life and HRQOL. The use of QALYs in health economic assessments of interventions for ADRD, however, is controversial and challenging [5, 96, 98].
The concept underlying a QALY is that patients move through ‘health states’ over time, with each health state having a value. QALYs are therefore calculated by multiplying the duration of time spent in a health state by the HRQOL weight (or utility) associated with that health state. Weights are measured on a scale of 0 to 1, where 0 indicates death and 1 indicates best possible health. Negative values indicate health states worse than death. Weights can be generated by either direct or generic preference-based measures. The latter includes questionnaires such as the EuroQol (EQ)-5D, Short Form 6D, and the Health Utilities Index.
While numerous studies have assessed QOL in ADRD, relatively fewer have translated their findings into the health utility or health state values that are required for QALY calculations (see Box 4) . Several QOL instruments such as the EQ-5D and DEMQOL have been used to quantify health utility weights in ADRD patients. Health utility values tend to decline with advancing disease severity, but a range of results have been reported within disease stages: mild AD (0.52–0.73); moderate AD (0.30–0.53); severe AD (0.12–0.49) . Moreover, based on a recent meta-regression analysis , health state values can vary according to whether they rely on self-reported versus proxy data, the type of instrument used, and the modes of administration (e.g., face-to-face interview, survey, or phone interview). The authors of that study concluded that different approaches to assess utility values can result in significant differences in QALYs and may therefore lead to contrasting results on the cost-effectiveness of health interventions.
Caregivers: Quality of life and caregiving burden
Caregiver QOL is evaluated using approaches similar to those used for patients, and in some cases the same scales can be applied to both caregivers and patients (e.g., EuroQoL, Short-Form Health Survey). However, more specific assessments (e.g., Care-Related QOL, Caregivers’ QOL Index) have been developed to capture various dimensions unique to caregiver QOL . The QOL of ADRD caregivers is a complex construct and is influenced by several factors . For example, studies have shown that caregivers can experience both a rise or decline in QOL in response to caring for a person with ADRD. Improvements in QOL have been attributed to many factors such as a positive sense of accomplishment or strengthened family ties; deteriorations have been tied to the negative emotional, social, financial, or physical burden associated with caring for a person with ADRD. There is consensus that more sensitive instruments are needed to measure the QOL associated with caregiving for ADRD patients [4, 95].
Measures of caregiver ‘burden’ evaluate the tasks required to provide caregiving (objective burden) and the caregiver’s perception on the degree to which caregiving has affected emotional, financial, physical and social functioning (subjective burden). The Zarit Burden Interview (ZBI) is one of the most commonly used scales to assess the subjective burden experienced by informal ADRD caregivers [24, 26, 74, 91, 99]. Similarly, the Caregiver Burden Inventory, among other instruments (e.g., Role Overload Scale, Caregiver Strain Index), have also been commonly used to measure the subjective and objective aspects of caregiver burden [29, 30, 56, 100]. As with patients, the Charlson comorbidity index is used to assess comorbid conditions in caregivers; however, there are numerous other instruments used in populations studies to gauge related aspects of health in caregivers, including depression (e.g., Center for Epidemiologic Studies Depression Scale), anxiety (e.g., Generalized Anxiety Disorder scale), mood (e.g., Positive and Negative Affect Scale), and sleep quality (e.g., Pittsburgh Sleep Quality Index) among others [29, 30, 101–103]. There is no clear consensus on the most appropriate instrument to use to gauge caregiver health status.
Figure 1 provides a depiction that represents the total burden of ADRD as not only measured societal costs but also hidden costs that, together with measured costs, represent a total burden that is much greater in magnitude and duration than is currently accurately assessed and appreciated.
The intangible costs of ADRD appear to exist years before the onset of dementia
Patients with subjective cognitive decline and MCI show a decline in almost every dimension of HRQOL compared with matched controls [104, 105]. Additionally, patients with MCI also contend with an increased risk of mortality . Similarly, caregiver burden also extends before ADRD symptom onset in caregivers of patients with MCI—depression and psychological comorbidity, although not as pronounced as in dementia caregivers, are common complications .
Informal caregiver burden increases over time and with disease severity
Several studies in community-dwelling ADRD patients have shown that caregiver burden, as measured with the ZBI questionnaire and other approaches, generally increases with disease severity, being directly related to patient functional abilities and level of dependence on the caregiver [91, 108, 109]. However, the link between caregiver QOL and the severity of dementia is currently unclear.
Informal caregivers report poorer health status and greater comorbid disease risk compared with non-caregivers
Several studies have demonstrated a strong correlation between caregiving and health status of the caregiver [29–31, 55, 99–102, 110–116]. For example, based on data from Brazil’s National Health and Wellness Survey, caregiving was associated with significantly increased risk of depressive symptoms, anxiety, insomnia, hypertension, pain, and diabetes . Similarly, a recent systematic review and meta-analysis found that the prevalence of depression among caregivers was 34.0%, anxiety 43.6%, and use of psychotropic drugs 27.2%, with increased probability of depression in female and spousal caregivers . Notably, female caregivers of ADRD patients are more likely to develop depression than male caregivers [110, 117]. The U.S. Alzheimer’s Association recently estimated the physical and emotional impact of dementia caregiving to have resulted in US$11.8 billion in health care costs in the U.S. in 2018 .
CONCLUSIONS, RECOMMENDATIONS, AND OUTLOOK
The magnitude and complexity of the socioeconomic costs of ADRD are staggering and rapidly increasing. Moreover, despite improvements in the quality of care for patients and the identification of several potentially modifiable risk factors , the causal mechanisms of ADRD are complex, multifactorial and not fully elucidated, and no disease-modifying intervention is available to delay, halt, or reverse the underlying pathology. Approved symptomatic treatments for AD (i.e., cholinesterase inhibitors and memantine), on average modestly improve or stabilize dementia-related cognitive and behavioral symptoms over short intervals of 6–12 months, and mitigate inevitable clinical decline over the course of several years [119–122]. Driven by greying populations across the globe, unrelenting growth in the prevalence of ADRD will therefore only magnify the human, societal, and economic burden of the disease—potentially overwhelming increasingly fragile support systems beyond the threshold of sustainability.
It is widely acknowledged that immediate policy action is necessary to curb the growing burden of ADRD in tandem with the ongoing efforts to develop more efficacious treatments or a prevention [4, 5, 123–125]. Success will require all stakeholders, including policymakers, healthcare industry leaders, advocacy groups, societies and associations, academia, biopharma, payers, clinicians, and researchers, to work shoulder-to-shoulder to address roadblocks that are hindering our understanding of the scope, scale and nature of the costs of ADRD so that we can develop, assess, and prioritize effective, evidence-based policies, strategies, and interventions to meet this growing global health crisis.
First, care for people with ADRD is provided by several sectors in society—with social care systems (e.g., long-term care and home services) and informal caregivers shouldering the greatest burden—and it is therefore difficult to isolate which sector is absorbing which costs. For example, most studies assessing direct costs of ADRD typically focus on the type of cost and generally do not distinguish which stakeholder absorbs the cost. Additionally, regions vary in the way that resources (and associated costs) are classified as belonging to the healthcare and/or social care systems, further complicating the task of delineating which stakeholder will shoulder the cost [22, 26, 38]. An added level of complexity in the ADRD arena is that informal care time could be framed or absorbed in diverse ways. For example, informal care could be viewed as an indirect cost absorbed by households (e.g., lost wages); however, if informal care is replaced by professional (paid) caregivers, it becomes a cost to health systems (or insurers), and paradoxically, a potential stimulus to the economy given that new jobs would be created.
Second, despite general agreement that indirect costs form a significant component of the total costs of ADRD, the quantification of these costs is problematic. Wide variability in cost estimates has been observed for informal care costs as well as productivity losses in patients, potentially due to differences in the methodologies used or study design. Furthermore, common approaches to valuing indirect costs may not fully capture other financial impacts on households, such as reduced expenditures or savings.
Third, a potentially massive component of the total cost of AD is ‘hidden’: symptoms and sequelae of the disease usually begin to manifest years, if not a decade, before diagnosis (see Fig. 2 for a conceptualized synthesis of the magnitude of costs borne by key stakeholders at different stages of disease). In the new National Institute on Aging-Alzheimer’s Association (NIA-AA) AD Research Framework, AD is conceptualized pathobiologically on a pathological continuum measured by core biomarkers relating to abnormal amyloid, tau, and neurodegeneration, as opposed to being characterized by clinical symptoms relating to increasing severity of cognitive and functional deficits as well as behavioral changes [19, 126, 127] (see Box 5). This shift in research thinking is likely to eventually have critical implications for clinical care, and in how we measure and assess the costs of the disease and the value of potential interventions. For instance, while most studies examining the costs of AD have focused on patients with dementia, there is evidence that the burden on patients, families and health systems may be elevated many years prior to a dementia diagnosis. This suggests that a sizable portion of the burden of the disease could be hidden before dementia is clinically diagnosed. Moreover, a biological definition of AD based on biomarkers also raises the intriguing possibility of intervening at earlier stages of the disease continuum. Indeed, several reports have suggested that significant savings could be realized by either slowing/delaying disease progression through lifestyle modification [128–130] or promoting early diagnosis .
AD has traditionally been defined based on clinico-pathological criteria. However, based in part on advances in the use of biomarkers, a clinico-biological approach was adopted by the International Work Group and recently by the NIA-AA 2018 “Research Framework”. Both approaches define AD biologically using biomarkers as proxies of neuropathology. Further, both approaches acknowledge AD as a pathologic continuum—a continuous process in both cognitive and biomarker domains, that can be divided into three clinical stages: a long preclinical period, followed by a prodromal or MCI phase with mild symptoms, and then dementia. However, the main update in the NIA-AA’s 2018 Framework is that cognitive impairment is now viewed, in the research realm, as a symptom/sign of the disease rather than a requirement for defining AD.
Finally, since ADRD are chronic, progressive disorders that often involve a decade or more of increasing and wide-ranging effects, assessing the full costs of disease and illness, or the full value of potential diagnostics and interventions, is not feasible during short-term studies involved in typical clinical trials [4, 28, 131]. Policymakers and stakeholders therefore need high-quality, long-term (ideally 5+ years), real-world data regarding disease progression rates, prevalence, costs, symptoms and clinical outcomes across the ADRD continuum to estimate future disease burden with confidence. However, such data are lacking [4, 5, 28]. While several studies have followed patients with ADRD longitudinally for periods up to 20 years (e.g., English Longitudinal Study on Aging, Swedish National Study on Aging) and may supply some of these data, these studies have generally been focused on patients with a dementia diagnosis and rely on a limited range of assessments [4, 28]. One recently launched industry-sponsored observational cohort study, the Insights to Model Alzheimer’s Progression in Real Life (initiated in January 2019) , aims to assess the clinical meaningfulness of selected cognitive test scores that may track changes along the spectrum of preclinical AD, prodromal AD/MCI due to AD, and dementia due to AD, and to gather 5-years of longitudinal data on mortality, institutionalization, dependence, costs, caregiver burden, and QOL.
The potential impact of research efforts to assess the long-term utility and costs of diagnostics and interventions in real-world clinical settings, while still lacking, is supported by recent preliminary results of shorter-term studies with quasi-experimental (case-control) designs. For example, the IDEAS Study in the U.S. is one recent attempt to measure the clinical value of new diagnostics by looking at approximately 18,500 Medicare beneficiaries aged 65 years and older with MCI or dementia in which etiological diagnosis was found to be in doubt by a dementia specialist in order to assess the clinical impact of amyloid-β PET scans on patient outcomes, treatments and costs. In this study, the US Centers for Medicare and Medicaid Services utilized the Coverage with Evidence Development mechanism to assess whether obtaining an amyloid-β PET scan may lead to substantial changes in short-term, 90-day diagnosis and management, and in intermediate-term, 12-month clinical events (e.g., hospitalizations, emergency department visits, testing) and direct costs. The recently published results of the 90-day outcomes support that amyloid PET results significantly changed both the clinical diagnosis (from AD to non-AD disease in 25%, and from non-AD to AD disease in 10%) and the composite outcome of clinical management (e.g., medications, counseling, additional testing) (in 60–63%) —results that are consistent with the ABIDE study performed in 507 patients seen at two dementia specialty centers in the Netherlands .
While it is inherently challenging, due to practical considerations, to demonstrate significant short-term cost savings associated with “earlier” timely and accurate diagnosis of CID, if paired with appropriate care, it is a face-valid proposition that outcomes should be improved and “total” costs mitigated. An example of research that aims to address the latter regarding direct costs is from a recently published real-world quasi-experimental case-control interventional study, involving more than 1,000 Medicare beneficiaries (and 2,100 database controls) aged 65 and older, that assessed the utility of a 3-year comprehensive dementia clinical care intervention program that consisted of structured needs assessments of patients and their caregivers, implementation of individualized care plans with input from primary care physicians, monitoring and revising care plans, referral to community organizations for dementia-related services and support, and access to a clinician for assistance and advice 24 hours per day, 7 days per week. This study found a reduction of admissions to long-term care facilities and an average direct cost savings of US$284 per participant per quarter (equivalent to US$1,136 per year) . Other interventional, care coordination, and real-world studies of care ecosystems are underway  and will be needed to provide the evidence-base to support the face validity that timely CID diagnosis and coordinated comprehensive support and care not only improve short- and long-term outcomes but also lead to longer term total cost savings.
In summary, the overall lack of up-to-date, comprehensive, and long-term “clinical effectiveness” data regarding real-world clinical outcomes and progression, and which also relate these outcomes to costs, burden, and impact parameters, constitute a major limitation of pharmacoeconomic models (e.g., decision analytical models) currently used at the policy level to quantify the effects of diagnostics and interventions for ADRD. Many such models have been informed by small sample sizes or are outdated; these include, for example, recent health technology appraisals of cholinesterase inhibitors and memantine by the National Institute for Health and Care Excellence (NICE) in the UK [28, 98].
It is evident that no single stakeholder can solve all the scientific, health system, and public health challenges related to ADRD experimental therapeutics, clinical care, prevention, and health care delivery alone. Such a complex problem requires solutions that involve collective commitment, collaboration, investment, and effort. Therefore, in line with recommendations from international groups and thought leaders [118, 123, 137–141], there is an urgent need for integrated and innovative approaches to measure, manage and mitigate the burden of AD by:
• Developing and implementing better tools, measures, and programs to more accurately assess the real-world costs of ADRD. For example, leveraging new technologies such as wearables and apps to more frequently and accurately measure the time and burden of caregiving-related activities (e.g., on a daily basis as opposed to retrospective reports of previous 30 days or several months as used by current questionnaires), or to quantify the frequency, duration, and nature of resource utilization. Such data could then be directly linked to actual costs incurred via electronic health records billing, and pharmacy and insurance databases (e.g., in Medicare patients).
• Establishing pre-competitive investments in real-world population observational studies and registries across the continuum of aging, cognitive impairment, and dementia to examine the relationships between cognitive aging, co-morbidities, and ADRD progression and costs across the totality of the aging, clinical syndromic, and disease spectrums. Also supporting real-world quasi-experimental and, when ethically possible, experimental studies to assess the clinical impact and long-term costs and benefits related to establishing and implementing best clinical practices  to improve timely diagnosis, disclosure, treatments, and care interventions in the CID spectrum due to ADRD.
• Establishing a better understanding of which stakeholder is ultimately absorbing the costs—whether health systems, insurers, social systems, employers, families or patients—to inform coordinated funding mechanisms for interventions and care paradigms that reflect all impacted “payers” and deliver greater value to patients, caregivers and their families (see Fig. 2).
• Building on an improved understanding of ADRD costs to develop more accurate cost-of-illness frameworks and forecasting models attuned to the socioeconomic realities of ADRD in order to support rational resource allocations and investment decisions.
• Investing and preparing for the advent of biomarker-based tests that can help accurately identify the hallmarks of ADRD and the contributions of multiple pathologies to clinical symptoms and CID, to improve provision of a timely diagnosis and to better inform prognosis and effects of early intervention and care. For example, fluid-based biomarkers, from blood and cerebrospinal fluid, and neuroimaging markers that could be employed in the use of potential future disease modifying therapies , which may have greatest impact at the earliest stages of disease, in order to select appropriate patients, and to monitor for safety and therapeutic effects.
• Ensuring that the assessment of the value of new treatment, management and care methods, whether care interventions, symptomatic treatments or disease modifying therapies for ADRD, account for their ‘full value’—including their potential to alleviate direct, indirect and intangible costs affecting the broad spectrum of stakeholders impacted by the disease.
Driven by greying populations across the globe, the costs of ADRD are predicted to become unsustainable. Although there is no cure, there is growing optimism that symptomatic stages of ADRD may be preventable or mitigated through a multi-pronged combination of risk factor reduction, early detection, novel therapeutics, and integrated care and support paradigms. A bold vision of a world in which ADRD is preventable and where patients and caregivers can receive the care and support needed to preserve a life of dignity and meaning was recently ratified at the 70th World Health Assembly, where member states endorsed an unprecedented global action plan on the public health response to dementia . However, a centrally emergent theme from this review is that it is challenging to gauge the true value of policies, programs or interventions in the ADRD arena given the long-term, progressive nature of the disease, its insidious socioeconomic impact beyond the patient and the formal healthcare system, and the complexities and current deficiencies (in measures and real-world data) in accurately calculating the full costs to society. By extension, such challenges can obfuscate decision-making on the effective allocation of funds and resources across healthcare, social care and other relevant sectors. There is therefore an urgent need for all stakeholders to establish a common understanding of the challenges in evaluating the full cost of ADRD and define approaches that allow us to measure these costs more accurately, with a view to prioritizing evidence-based solutions to mitigate this looming public health crises.
This work was partially sponsored by F. Hoffman-La Roche Ltd (see below). We would like to thank Jean Georges (Executive Director Alzheimer Europe) for his suggestions and feedback on early drafts of this manuscript.
Shift Health consults with organizations across the health and life sciences sector, including F. Hoffman-La Roche Ltd. Authors from Shift Health (REW, CPK, YEH, RD) were employed under contract with Hoffman-La Roche Ltd. for the purposes of this work. Authors not employed by Shift Health (CB, ARE, MK, JLM, MN, and AA) did not receive support or remuneration related to this work.
Authors’ disclosures available online (https://www.j-alz.com/manuscript-disclosures/19-0426).
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