Table 2.

Characteristics of dynamic electrocardiograms of patients during sleep time and nonsleep time.

Groups	Number of long R-R intervals (n = 48,840)	Average ventricular rate (times/min)	Slowest ventricular rate (times/min)	Fastest ventricular rate (times/min)
Sleep time	12053 (24.68%)	82.56 ± 6.89	41.46 ± 6.47	155.52 ± 12.26
Nonsleep time	36787 (75.32%)	70.24 ± 8.51	35.51 ± 5.89	131.48 ± 10.87
χ 2/t	250.50.012	22.475	4.809	29.307
P	<0.001	<0.001	<0.001	<0.001