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Fig. 3 | Environmental Health

Fig. 3

From: Effect of short-term exposure to particulate air pollution on heart rate variability in normal-weight and obese adults

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

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