Aging and Hypertension among the Global Poor—Panel Data Evidence from Malawi

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Penn collection
Population Center Working Papers (PSC/PARC)
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low-income countries
Mature Adults Cohort of the Malawi Longitudinal Study of Families and Health (MLSFH-MAC)
sub-Saharan Africa
cardiovascular risk
non-communicable diseases
Demography, Population, and Ecology
Family, Life Course, and Society
Inequality and Stratification
Medicine and Health
Social and Behavioral Sciences
We gratefully acknowledge the generous support for the Malawi Longitudinal Study of Families and Health (MLSFH) by the Rockefeller Foundation; the National Institute of Child Health and Human Development (NICHD, Grant# R01 HD053781, R01 HD087391); the National Institute on Aging (NIA, Grant# P30 AG12836 and R21 AG053763); the Boettner Center for Pensions and Retirement Security at the University of Pennsylvania; and the NICHD Population Research Infrastructure Program (Grant# R24 HD-044964), all at the University of Pennsylvania. We are also grateful for support through the Swiss Programme for Research on Global Issues for Development (SNF r4d Grant 400640-160374) as well as pilot funding received through the Penn Center for AIDS Research (CFAR), supported by NIAID AI 045008 and the Penn Institute on Aging.
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Background: Hypertension has a rapidly growing disease burden among older persons in low-income countries (LICs) that is often inadequately diagnosed and treated. Yet, most LIC research on hypertension is based on cross-sectional data that does not allow inferences about the onset or persistence of hypertension, its correlates, and changes in hypertension as individuals become older. Data and methods: The Mature Adults Cohort of the Malawi Longitudinal Study of Families and Health (MLSFH-MAC) is used to provide among the first panel analyses of hypertension for older individuals in a sub-Saharan LIC using blood pressure measurements obtained in 2013 and 2017. Findings: High blood pressure is very common among mature adults aged 45+ in rural Malawi, and hypertension is more prevalent among older as compared to middle-aged respondents. Yet, in panel analyses for 2013-17, we find no increase in the prevalence of hypertension as individuals become older. Hypertension often persists over time, and the onset of hypertension is predicted by factors such as being overweight/obese, or being in poor physical health. Otherwise, however, hypertension has few socioeconomic predictors. There is also no gender differences in the level, onset or persistence in hypertension. While hypertension is associated with several negative health or socioeconomic consequences in longitudinal analyses, cascade-of-care analyses document significant gaps in the diagnosis and treatment of hypertension. Conclusions: Our findings indicate that hypertension and related high cardiovascular risks are widespread, persistent, and often not diagnosed or treated in this rural sub-Saharan population of older individuals. Prevalence, onset and persistence of hypertension are common across all subgroups-including, importantly, both women and men. While age is an important predictor of hypertension risk, even in middle ages 45-55 years, hypertension is already widespread. Hypertension among adults aged 45+ in Malawi is thus more similar to a "generalized epidemic" than in high-income countries where cardiovascular risk has strong socioeconomic gradients and untreated hypertension particularly prevalent in vulnerable subsets of older persons.

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