key: cord-0298700-6py717lu authors: Shrinivas, A.; Jalota, S.; Mahajan, A.; Miller, G. title: Illness and Wage Loss: Longitudinal Evidence from India (and Implications for the Universal Health Coverage Agenda) date: 2021-11-09 journal: nan DOI: 10.1101/2021.11.04.21265892 sha: 9b9b7a6efbea046af918ad9e721a7f4ea058a965 doc_id: 298700 cord_uid: 6py717lu Background: A key aim of Universal Health Coverage (UHC) is to protect individuals and households against the financial risk of illness. Large-scale health insurance expansions are therefore a central focus of the UHC agenda. Importantly, however, health insurance does not protect against a key dimension of financial risk associated with illness: forgone wage income (due to short-term disability). In this paper, we quantify the economic burden of illness in India attributable--separately--to wage loss and to medical care spending, as well as differences in them across the socio-economic distribution. Methods: We use data from two Indian longitudinal household surveys: (i) the Village Dynamics in South Asia (VDSA) survey (1,350 households surveyed every month for 60 months between 2010 and 2015) and (ii) the Indian Human Development Survey (IHDS) (more than 40,000 households surveyed in 2005 and again in 2011). The VDSA allows us to study the economic dynamics of illness using high-frequency observations, and the IHDS allows us to confirm our findings in a nationally-representative sample. Both contain individual- and household-level information about illness, wage income, and medical spending over time. We use longitudinal variation in illness to estimate regression models of economic burden separately for wage loss and medical care spending across the socio-economic distribution. Our regression models include a series of fixed effects that control for differences in time-invariant household (or individual) characteristics and time-varying factors common across households. Findings: 1,184 households (88%) in the VDSA sample reported an episode of illness over 60 months, and 15770 households (40%) in the IHDS reported an illness in the preceding year. In the VDSA sample, on average, a day of illness was associated with a reduction in monthly per capita wage income of Rs 77 [95% CI -99 to -57] and an increase in monthly per capita medical spending of Rs 126 [95% CI 110-142]. Variation across the socio-economic distribution was substantial. Among the poorest households, wage loss due to illness is roughly 15% of total household spending--nearly three times greater than medical spending. Alternatively, among the most affluent households, wage loss is less than 5% of total household spending--and only one-third of medical spending. Put differently, wage loss accounts for more than 80% of the total economic burden of illness among the poorest households, but only about 20% of the economic burden of illness among the most affluent. Estimates from the IHDS sample show that this socio-economic gradient is present in the Indian population generally. Interpretation: Wage loss accounts for a substantial share of the total economic burden of illness in India--and disproportionately so among the poorest households. If Universal Health Coverage truly aims to protect households against the financial risk of illness--particularly poor households, the inclusion of wage loss insurance or another illness-related income replacement benefit is needed. 1,184 households (88%) in the VDSA sample reported an episode of illness over 60 months, and 15770 households (40%) in the IHDS reported an illness in the preceding year. In the VDSA sample, on average, a day of illness was associated with a reduction in monthly per capita wage income of Rs 77 [95% CI -99 to -57] and an increase in monthly per capita medical spending of Rs 126 [95% CI . Variation across the socioeconomic distribution was substantial. Among the poorest households, wage loss due to illness is roughly 15% of total household spending -nearly three times greater than medical spending. Alternatively, among the most affluent households, wage loss is less than 5% of total household spending -and only one-third of medical spending. Put differently, wage loss accounts for more than 80% of the total economic burden of illness among the poorest households, but only about 20% of the economic burden of illness among the most affluent. Estimates from the IHDS sample show that this socio-economic gradient is present in the Indian population generally. Wage loss accounts for a substantial share of the total economic burden of illness in India -and disproportionately so among the poorest households. If Universal Health Coverage truly aims to protect households against the financial risk of illness -particularly poor households, the inclusion of wage loss insurance or another illness-related income replacement benefit is needed. . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint Evidence before this study We searched Google Scholar for the terms "burden of illness, economic impact of health shock, poor households" and found several systematic reviews of the economic burden of illness in low-and middle-income countries. We then reviewed these articles and the ones that they incorporate. The economic burden of illness among households in low-and middle-income countries is well-established and substantial. However, the vast majority of existing studies focus only on economic burden due to medical care spending, with limited and mixed evidence on wage loss. One systematic review concludes that the economic burden of illness on wage loss is unclear, with some studies showing no effect at all. Our paper makes two contributions. First, it directly estimates and compares the magnitude of wage loss and direct medical care expenses due to illness using detailed, high frequency data on wage earnings and illness. Past studies have largely focused on either total economic burden or medical care costs, but our direct comparison informs health policies focused on strengthening financial protection. Our high frequency data allow us to pinpoint precise temporal relationships between illness and its economic burden that have not been possible with other commonly-used longitudinal surveys. Second, given the large number of longitudinal observations for each household in the data, our paper is the first to produce household-specific estimates of the burden of illness, enabling us to traceout both wage loss and medical care expenses flexibly across the distribution of household economic status -enabling a more granular analysis of disparities between the poor and more affluent. We show that in India, which accounts for nearly half of those impoverished due to illness globally, wage loss accounts for more than 80% of the total economic burden of illness among the poorest households, but only about 20% of the economic burden of illness among the most affluent ones. In contributing to existing evidence, the findings of this paper suggest that even if successful, the current Universal Health Coverage (UHC) agenda may still not protect poor households in India (and potentially many low-and middle-income countries) from substantial economic burden due to illness. If Universal Health Coverage in countries like India truly aims to protect households against the total economic burden of illness -particularly poor households, wage loss insurance or another health-related income-replacement benefit is required along with health insurance. A central aim of Universal Health Coverage (UHC) is to protect individuals and households against the financial risk of illness -with particular emphasis on poor, vulnerable, and marginalized segments of the population. 1 This goal is supported by a substantial body of evidence estimating that nearly 100 million people worldwide are pushed into extreme poverty each year because of out-of-pocket spending for unanticipated medical care needs. 2 The rise in non-communicable diseases (NCDs) is pushing these estimates higher, 3 and the SARS-CoV-2 pandemic is presumably as well. Globally, India -the focus of this paper -accounts for nearly half of those impoverished due to illness, and illness is a leading cause of indebtedness and poverty. [4] [5] [6] [7] [8] Large-scale health insurance expansions in India, and in low-and middle-income countries generally, are therefore a central focus of the UHC agenda. [9] [10] [11] [12] [13] Importantly, however, health insurance does not protect against the other key dimension of financial risk associated with illness: wage loss. In many high-income countries, health and wage loss (or short-term disability) insurance exist in tandem to protect against both forms of risk. [14] [15] [16] [17] However, in lower-income countries, wage loss insurance or illnessrelated income replacement benefits are often absent, meaning that for every day a working individual is sick and unable to work, that individual is not paid (and coverage of existing programs often excludes informal workers). 18 This concern that applies disproportionately to the poor, who are more likely to be day-laborers (without sick leave) rather than salaried employees. . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint Nonetheless, the extent to which wage loss due to illness is an important source of economic burden in lower-income countries -and its magnitude relative to out-of-pocket medical spending -is largely unmeasured. A large body of research documents a substantial economic burden of illness among households in India and in low-and middle-income countries generally. [19] [20] [21] [22] However, this research has largely focused on out-of-pocket medical spending, [23] [24] [25] [26] [27] with limited evidence on wage loss. [28] [29] [30] [31] One systematic review concludes that the economic burden of illness due to wage loss is unclear, with some studies suggesting no effect at all. 18 Moreover, few studies have explicitly considered the relative size of wage loss and out-of-pocket medical spending (the two major components of financial risk associated with illness) 30-34 -nor differences in them across the socio-economic distribution. 35 In this paper, we quantity the relative importance of wage loss and medical spending due to illness, as well as variation in their relative magnitude across the socio-economic distribution. We also demonstrate that although standard measures of financial risk due to illness (defined as household medical spending as a share of total spending) sometimes counterintuitively suggest that more affluent households face relatively greater risk (presumably due, in part, to inequality in access to health care), this result is reversed when wage loss is incorporated. 36, 37 Ultimately, our results demonstrate the significance of disability risk (or wage loss due to illness) as an important but under-recognized issue relevant to the UHC agenda -particularly among the poorest households. . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint We use two longitudinal datasets to estimate wage loss and medical spending due to illness among households across the socio-economic distribution: the Village Dynamics For our purposes, the high frequency collection of data on illness, wages, and spending at the household level is particularly useful (and rare). For each household in the VDSA sample, we code an illness episode for a household as a binary outcome equal to 1 if any . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint member in the household reported an illness in a given month, and zero otherwise. We also code wage income for households as the sum of earned wage income for all household members (capturing compensating changes in the labor supply of other household members when an individual becomes sick) and income earned from household businesses. To measure medical care spending, we use monthly data on total household spending for medical care. Despite the VDSA survey's detail and high frequency, it is not representative of the broader Indian population. Therefore, in harmonized parallel analyses, we also use the To conduct harmonized analyses that can be implemented in both the VDSA and IHDS samples in the same way (with comparable measurement of illness, wage income, and medical spending over the same lengths of time), we construct individual-year observations in each dataset. We code illness episodes in both datasets as an individual's . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint number of sick days in the preceding year due to major illness. To measure household wage income, we sum monthly data on wage income in the VDSA data, and we use wages exclusive of benefits or bonuses in the IHDS data. For medical spending, we sum monthly data on medical spending in the VDSA data, and we use total spending for services, medicines, hospitalizations, and travel to health facilities in the IHDS data. Finally, to measure the socio-economic status of households in both surveys at the start of their survey periods, we follow a standard convention in economics by using baseline total household spending per capita (henceforth "economic status" -consumption spending per capita, broadly defined, is a widely-used measure of economic well-being [38] [39] [40] and has been used by others studying the effect of illness on consumption spending 30 ). Appendix Table A1 provides summary statistics for both the VDSA and IHDS samples. Our statistical approach uses longitudinal variation within households in both the VDSA and IHDS samples to estimate the economic burden of illness separately for wage income and medical spending. Because the structure (and frequency) of two data sources differ, we use variants of the same general statistical framework, focusing first on the VDSA data (to capitalize on the strengths of its monthly survey waves), and then conducting parallel analyses using a statistical framework that can be implemented in the same way in both datasets (to consider how our results generalize to the broader Indian population). . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint Our statistical analysis proceeds in two steps. We first leverage the richness of the VDSA sample (with 60 monthly observations per household) to estimate the following household-level model: where ℎ is an outcome for household ℎ in month (either wage income per capita or medical spending per capita); ℎ is an indicator variable equal to 1 if any member in household ℎ reported an illness in month and 0 otherwise; and ℎ and are household and month fixed effects, respectively. This approach uses within-household variation in illness episodes over time to estimate the household-specific burden of illness separately for wage income and medical spending (i.e. the coefficient on illness differs across households). The remarkably high frequency VDSA sample enables us to study the household-specific temporal nuances of illness episodes and their consequences. Importantly, because the two components of total economic burden may vary considerably between poorer and wealthier households, we use household-specific estimates and show that the relative magnitudes of wage loss and medical spending vary systematically across the distribution of socio-economic status. We plot these householdspecific estimates by economic status using a flexible polynomial fit. Then, using a regression framework that can be implemented in the same way in both the VDSA and IHDS samples, we estimate the economic burden due to wage loss and medical spending at the individual-year level: . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. In the VDSA sample, over a period of 60 months, is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint [95% CI -10 -50]), and then rises steeply among wealthier ones, reaching Rs. 450 per capita per month [95% CI 350-500] (presumably reflecting, at least in part, underlying differences in access to medical care). Figure 1 Panel B shows, at each point across the economic distribution, the relative size of wage loss and medical spending as a share of total household spending at baseline. Strikingly, among the poorest households, wage loss due to illness is around 15% of total household spending -nearly three times greater than the size of medical spending (which is approximately 5% of household spending). Alternatively, for the most affluent households, wage loss is less than 5% of total household spending, while medical spending is about three times greater, at roughly 15% of total spending. . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint We then use the harmonized VDSA and nationally-representative IHDS samples to consider the extent to which the VDSA results (shown in Figure 1 ) generalize to the broader Indian population. As Appendix Table A1 shows, in the IHDS sample, more than Turning to how these results vary across the distribution of economic status, Figure 2 , Panel A also shows that wage loss is generally greater among poorer households (in the . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint lowest economic status quintile, for example) -although this magnitude is larger in the harmonized VDSA than in the IHDS sample. At the same time, in both data sets, the reduction in wage earnings due to illness is relatively smaller among those with higher economic status. Finally, in both the harmonized VDSA and IHDS samples, medical spending due to illness is relatively smaller at lower quintiles and larger at higher quintiles. In this study, we show that wage loss accounts for a substantial portion of the total economic burden of illness in India. Importantly, this is disproportionately true among the poorest households. In the high-frequency VDSA sample, more than 80% of the economic burden of illness is due to wage loss among the poorest households -a figure that drops to about 20% among the most affluent households. Although this gradient across the economic distribution is somewhat less steep in the nationally-representative . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint IHDS sample, the same general pattern is present. These findings suggest that even if successful, the current Universal Health Coverage (UHC) agenda may still not protect households in India, and potentially many low-and middle-income countries, from substantial financial risk due to illness. Our paper makes three contributions to existing studies of the economic burden of illness. First, it directly estimates and compares the magnitude of wage loss and direct medical care expenses due to illness using detailed, high-frequency data on wage earnings (including informal activities), medical spending and illness. Past studies have largely focused on either total economic burden or medical care costs, but our direct comparison informs health policies focused on strengthening financial protection. Second, we show that the seemingly counterintuitive result that more affluent households face relatively greater financial risk due to illness (obtained using standard measures of financial risk, defined as household medical spending as a share of total spending) reported by other studies is reversed when wage loss is incorporated. 36, 37 Third, given the large number of longitudinal observations for each household in the VDSA sample, to the best of our knowledge, our paper is the first to produce household-specific estimates of the burden of illness, enabling us to trace-out both wage loss and medical care expenses flexibly across the distribution of household economic status -enabling a more granular analysis of disparities between the poor and more affluent. Our study also has several limitations. First, in comparing the relative magnitude of economic burden due to wage loss versus medical care spending, it examines . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint environments in which a degree of health insurance already exists. In India, for example, basic primary care provided by the public sector is in principle free, and many state health insurance schemes have emerged along with the national Rashtriya Swasthya Bima Yojana (RSBY) program. However, the majority of outpatient services in India are provided by private providers (frequently in the informal sector), and by 2014 (several years after the 2011 IHDS wave), only about one-fifth of hospitalized households had some form of formal insurance coverage. 41 Second, the relationship between illness and income is complex and likely bi-directional (for instance, lower income and the concomitant poorer nutrition and other amenities may cause or exacerbate illness). Our approach, including fixed-effect analysis is a useful approach to addressing some of the problems posed by examining simple correlations between illness and income, but more work is clearly needed. Third, results from India, even those estimated in a nationallyrepresentative sample, do not necessarily generalize to other countries. Nonetheless, India is the second most populous country in the world and is therefore an important marker of progress toward achieving Universal Health Coverage and the Sustainable Development Goals (SDGs). 42 If there were greater policy emphasis placed on wage loss due to illness -and insurance against this risk (through wage loss or short-term disability insurance, for example), verification would present a difficult challenge in the design and implementation of such programs. In high-income countries, clinician certification of illness or disability is commonly required to initiate the provision of benefits. However, in environments like India, where a substantial share of healthcare providers are in the informal sector (with . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint little or no formal clinical training and limited regulation), 36 the challenges of verifying illness are likely to be more substantial. An imperfect solution to this challenge has been the emergence of hospital cash benefits or hospital confinement indemnity insurance, which provide benefits commonly indexed to a beneficiaries' wage rate -but requiring hospitalization to initiate the payment of benefits (and hence may reflect inequality in access to health care, for example). Moreover, we note that a considerable amount of informal insurance exists in low-and middle-income countries (through transfers from extended family members and social network members, for example). However, a large body of research shows that "consumption smoothing" through informal insurance mechanisms is both incomplete and inefficient in India and other countries, 31, [43] [44] [45] suggesting that potentially large welfare gains could still be achieved by the provision of formal wage loss or disability insurance, even to those with other sources of informal support. Further research should consider the types of illnesses (major morbidities versus short-term morbidities, for example) and other types of conditions (locations, occupations, household member relationships to the primary income earner, etc.) for which disability risk is most substantial. Finally, there has been recent debate about how widely to interpret the aim of providing "financial protection" through UHC, with some arguing for a narrower focus on out-ofpocket medical spending alone, 46 and others proposing a more expansive approach that incorporates wage loss due to illness. 47 We inform this debate by providing direct . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint quantitative evidence on the relative importance of both components of the burden of illness. In particular, we show that among the poorest households, wage loss is a much larger part of the full financial burden of illness -a result with important implications for the recently created Lancet Citizen's Commission on Reimagining India's Health System. 48 . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint medical spending, and shows the economic burden as a percentage of total household spending. Panel C shows wage loss as a percentage of total household spending. In all panels, wage loss results are shown in blue, and medical spending results are shown in red. Figure A1 : The map of India shows the locations of the villages in the ICRSAT dataset across nine states . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint Figure 1 : Economic Burden of Illness on Wage loss and Medical Spending . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint Figure 2 : Economic Burden of Illness on Medical Expenses and Wage loss using harmonized VDSA and IHDS sample . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint Author Contributions: GM and AS conceived the research idea. SJ, AS, GM, and AM contributed to the analytic design, data analysis, and interpretation. All authors contributed to the drafting and revising of the manuscript. The funding organizations had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication. None . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint APPENDIX TABLE A1 . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint TABLE A2 . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. (which was not certified by peer review) The copyright holder for this preprint this version posted November 9, 2021. ; https://doi.org/10.1101/2021.11.04.21265892 doi: medRxiv preprint Figure A1 : Locations of ICRISAT VDSA villages . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. 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