Table 3.

Comparison of sleep parameters among primary school students pre- and during COVID.

Sleep Parameters	Pre-COVID (n = 246) Mean (SD)	COVID (n = 545) Mean (SD)	P
School days
Bedtime, hh:mm	22:08 (±45 min)	22:09 (±51 min)	.84
Sleep onset time, hh:mm	22:22 (±47 min)	22:27 (±51 min)	.25
Sleep midpoint time, hh:mm	2:42 (±29 min)	2:42 (±37 min)	.94
Wake up time, hh:mm	7:01 (±37 min)	6:57 (±25 min)	.13
Sleep latency, hh:mm	0:13 (±12 min)	0:17 (±13 min)	< .001
Sleep duration, hh:mm	8:39 (±48 min)	8:30 (±50 min)	.03
Nonschool days
Bedtime, hh:mm	22:56 (±53 min)	22:55 (±61 min)	.91
Sleep onset time, hh:mm	23:12 (±56 min)	23:17 (±62 min)	.31
Sleep midpoint time, hh:mm	3:59 (±56 min)	4:06 (±60 min)	.17
Wake up time, hh:mm	8:47 (±70 min)	8:55 (±74 min)	.17
Sleep latency, hh:mm	0:16 (±15 min)	0:21 (±17 min)	< .001
Sleep duration, hh:mm	9:34 (±59 min)	9:37 (±65 min)	.53
Social jetlag, hh:mm	1:17 (±52 min)	1:23 (±48 min)	.11

SD = standard deviation.