nearly significantp = 0.07
For PM 2.5 , there was a significant ( p = 0.03) decrease in RMSSD and a nearly significant ( p = 0.07) decrease in SDNN for the 0130- to 0430-hr interval but no such an association during the 1600- to 1800-hr period.
For PM 2.5 , there was a significant ( p = 0.03) decrease in RMSSD and a nearly significant ( p = 0.07) decrease in SDNN for the 0130- to 0430-hr interval but no such an association during the 1600- to 1800-hr period.