Associations of PM2.5, NO2 and ozone with cardiovascular disease, coronary heart disease and cerebrovascular disease hospitalization in stratified analyses by age (65–74, 75–84, 85 + years), Medicaid eligibility (not eligible, eligible), race (White, Black, unknown/other), US region (Midwest, Northeast, Southeast, Southwest and West) and sex (male, female) a. a Associations are expressed per IQR increase (IQR PM2.5 = 4.0 μg/m3, IQR NO2 = 13.9 ppb, IQR Ozone = 4.4 ppb) of the cardiovascular disease hospitalization cohort. Models included PM2.5, NO2 and ozone and were adjusted for calendar year, US census covariates, BRFSS covariates, US regions, an offset for total person-time and strata for all possible combinations of sex, race, Medicaid Eligibility, age at study entry (2-year categories), and follow-up year.