Fig. 3
Exposure–response relationship between 30-min personal PM2.5 and BC moving average and HF with 95% CI under generalized additive models in all subjects, normal-weight and obese individuals. The degree of freedom was estimated by generalized cross validation. a and c, waking hours; b and d, sleeping hours. PM2.5, fine particulate matter; BC, black carbon; HF, high frequency power; CI, confidence intervals