Fig. 2
Estimated percent changes with 95% CI in HRV and HR per IQR increase in personal PM2.5/BC at different moving averages in the normal-weight and obese groups during sleep. a, Total power; b, SDNN; C, HF; D, LF; E, LF/HF; F, HR. CI, confidence intervals; HRV, heart rate variability; HR, heart rate; IQR, interquartile range; PM2.5, fine particulate matter; BC, black carbon; SDNN, standard deviation of all normal-to-normal (NN) intervals; HF, high frequency power; LF, low frequency power; LF/HF, ratio of low-frequency power to high-frequency power