Figure 3.
Geometric mean (GM) ratios of common and internal carotid intima‐media thickness (cIMT) comparing quartile 4 of secondhand smoke (SHS) to unexposed, stratified by participant characteristics, Multi‐Ethnic Study of Atherosclerosis (MESA), United States, 2000–2002. GM ratios for subclinical atherosclerosis comparing the fourth quartile of SHS participants and unexposed SHS (N=3442), by participant characteristics, MESA, 2000–2002. GM ratios were adjusted for age in years, sex, race/ethnicity, study site, education (high school or less [reference], some college but no degree/technical school certificate, associate's degree/bachelor's degree/graduate degree), income (<$25 000/y [reference]/≥$25 000/y), hypertension medication (no [reference]/yes), systolic blood pressure (mm Hg), diabetes mellitus (normal [reference] vs untreated diabetes mellitus/treated diabetes mellitus), low‐density lipoprotein cholesterol (mg/dL), treatment for dyslipidemia (no [reference]/yes), physical activity (metabolic equivalent, h/wk), and smoking status (never [reference]/former), and body mass index (BMI) (kg/m2). Estimated 2‐sided P values for the interaction between SHS exposure with participants’ characteristics were computed using the Wald test.