Fig. 1
Stratified analysis on associations between long-term PM2.5 (A) and NO2 (B) exposure (unit increments, 1 µg/m3 for PM2.5, and 1 ppb for NO2) and systolic blood pressure (cSBP), and pulse pressure (cPP). Effect estimates (coefficients) are derived from mixed effect analysis, and bars cover 95% confidence intervals. Results were obtained from final models with participants having stable residence history and adjusted for age (not in age-stratified analysis), BMI (not in BMI-stratified analysis), race (not in race-stratified analysis), sex (not in sex-stratified analysis), smoking status (not in smoking status-stratified analysis), waist, alcohol consumption, education, income, marital status, season, Type 2 diabetes, and hypertension