Fig. 3
Association between PM2.5 exposure and cardiovascular risk factors prevalence stratified by covariates. Population was stratified by age, sex, education, ethnicity, smoking status, drinking status, intensity of physical activity, and diet types. The odds ratios and relevant 95% CI were scaled to each 10 μg/m3 PM2.5 exposure and calculated by multivariable logistic regression, and further adjusted for age, sex, education, ethnicity, smoking status, drinking status, intensity of physical activity, and diet types. The significance of interaction effect was tested by introducing an interaction term in the regression model