Health Disparities
Macroeconomic Context Shapes Individual-Level Income Volatility Effects on Hypertension: A Cohort Comparison Mehrnaz Siavoshi* Mehrnaz Siavoshi Walden University
Background
Individual economic experiences unfold within historical contexts of varying macroeconomic stability. We tested whether birth cohort modifies the association between personal income variability and hypertension risk, reflecting the time and place principle of life course theory.
Methods
Among 8,021 PSID participants born 1940s-1980s with 30+ years follow-up, we examined timing-specific income variability during early adulthood (ages 20-35) versus midlife (ages 36-50). Participants were categorized into four timing groups based on high/low variability in each period. Cox models stratified by birth decade tested whether cohort moderated variability-hypertension associations.
Results
Timing patterns varied dramatically by cohort. The 1940s cohort experienced predominantly low early variability with emerging midlife instability (42.8% Low+High), while 1960s/1970s cohorts showed opposite patterns (36.6% and 34.0% High+High) (χ²=20.03, p<0.01). Among 1960s/1970s cohorts exposed to Reaganomics and dot-com volatility, high early-life variability was protective against hypertension (HR 0.84, 95% CI 0.78-0.91), whereas high midlife variability increased risk (HR 1.29, 95% CI 1.19-1.40). The 1940s cohort, who experienced post-WWII expansion, showed attenuated effects.
Conclusion
The health consequences of individual income instability depend on macroeconomic context. Cohorts entering adulthood during eras of structural volatility may develop different adaptive responses than those experiencing predictable economic expansion. These findings highlight that individual-level risk factors cannot be fully understood without considering the historical moment, with implications for targeting interventions to cohorts differentially exposed to economic upheaval.