Stroke disparities in older Americans: is wealth a more powerful indicator of risk than income and education?

TitleStroke disparities in older Americans: is wealth a more powerful indicator of risk than income and education?
Publication TypeJournal Article
Year of Publication2008
AuthorsAvendano, M, M. Glymour, M
Date Published2008 May
ISSN Number1524-4628
Call Numbernewpubs20090908/Stroke1533.pdf
KeywordsAge Distribution, Age Factors, Aged, Cohort Studies, Educational Status, Female, Humans, Incidence, Income, Life Style, Longitudinal Studies, Male, Middle Aged, Proportional Hazards Models, Risk Factors, Socioeconomic factors, Stroke, United States

BACKGROUND AND PURPOSE: This study examines the independent effect of wealth, income, and education on stroke and how these disparities evolve throughout middle and old age in a representative cohort of older Americans.

METHODS: Stroke-free participants in the Health and Retirement Study (n=19,565) were followed for an average of 8.5 years. Total wealth, income, and education assessed at baseline were used in Cox proportional hazards models to predict time to stroke. Separate models were estimated for 3 age-strata (50 to 64, 65 to 74, and >or=75), and incorporating risk factor measures (smoking, physical activity, body mass index, hypertension, diabetes, and heart disease).

RESULTS: 1542 subjects developed incident stroke. Higher education predicted reduced stroke risk at ages 50 to 64, but not after adjustment for wealth and income. Wealth and income were independent risk factors for stroke at ages 50 to 64. Adjusted hazard ratios comparing the lowest decile with the 75th-90th percentiles were 2.3 (95% CI 1.6, 3.4) for wealth and 1.8 (95% CI 1.3, 2.6) for income. Risk factor adjustment attenuated these effects by 30% to 50%, but coefficients for both wealth (HR=1.7, 95% CI 1.2, 2.5) and income (HR=1.6, 95% CI 1.2, 2.3) remained significant. Wealth, income, and education did not consistently predict stroke beyond age 65.

CONCLUSIONS: Wealth and income are independent predictors of stroke at ages 50 to 64 but do not predict stroke among the elderly. This age patterning might reflect buffering of the negative effect of low socioeconomic status by improved access to social and health care programs at old ages, but may also be an artifact of selective survival.

Endnote Keywords

Stroke/Socioeconomic Factors/Education/income

Endnote ID


Citation Key7269
PubMed ID18436891
PubMed Central IDPMC3079499
Grant ListR01 AG023399 / AG / NIA NIH HHS / United States
R01 AG023399-01 / AG / NIA NIH HHS / United States
AG023399 / AG / NIA NIH HHS / United States