Table 4.

Comparison of the BISQ items among infants with or without sleep problems based on maternal view

Items	Maternal view		p a
	With no sleep problem (n = 568)	With mild to severe sleep problems (n = 78)
Nocturnal sleep duration (hour)	7.78 ± 1.26b	7.16 ± 1.26	< 0.001
Daytime sleep duration (hour)	3.79 ± 1.63	3.97 ± 1.64	0.475
Number of waking at night	0.72 ± 1.19	2.12 ± 1.80	< 0.001
Night waking duration (hour)	1.22 ± 1.07	1.96 ± 1.32	< 0.001
Nocturnal sleep latency (hour)	0.30 ± 0.22	0.43 ± 0.28	< 0.001
Sleep onset time (hour)	23.19 ± 1.02	23.74 ± 1.30	< 0.001

Abbreviations BISQ: Brief Infant Sleep Questionnaire

^a Calculated by the Mann‒Whitney test

^b Mean ± SD