Fig. 4
Subgroup analysis of the relationship of PM1, PM2.5, PM10, O3, and NO2 exposure (10 µg/m3) with the risk of hypertension in different physical activity among 7629 participants: the results of time-varying Cox regression analysis. Separate analyses were performed for each one of the pollutants and each analysis was adjusted for age group, gender, SES factors (educational level, residence, marital status, medical insurance, income, employment status), season and spatial autocorrelation, behavioural factors (smoking status, alcohol consumption, sleep duration and physical activity).
