Background
To measure the explanatory role of behavioral factors to educational and income disparities in mortality among U.S. adults (ages 25+).
Methods
Data were from 4 waves of the American Changing Lives Study (N=3,617). There were 1,832 deaths between 1986 and 2011. Smoking, physical activity, alcohol, and BMI were examined.
Results
Those with 0–11 years of schooling had an 88% (95% CI: 48%, 139%) increased risk of dying compared to those with 16+ years of schooling. Behavioral factors explained 41% (95% CI: 26%, 55%) and 50% (95% CI: 30%, 70%) of this excess in models that treated behavioral factors as fixed (single point in time) and time-varying (repeated), respectively. The lowest income group (bottom 20th percentile) had a 209% (95% CI: 172%, 256%) increased risk of dying relative to the highest income group (top 40th percentile). Behavioral factors explained 24% (fixed, 95% CI: 13%, 35%) and 39% (repeated, 95% CI: 22%, 56%) of this difference. Analyses of deaths by causes indicated that behavioral factors were more consequential to disparities in cardiovascular mortality, explaining up to 83% of educational differences, compared to cancer and other death causes.
Conclusion
Behavioral factors are one of a number of factors which explain socioeconomic mortality disparities, but their estimated explanatory role depends on a number of parameters including the SES measure examined, the cause of death, and age. In this nationally representative sample, findings based on repeated measures did not warrant a reevaluation of earlier estimates.