Table 5.

The association of BISQ quantitative items with ISQ total score

Items	Correlation with ISQ total score	p
	rs
Nocturnal sleep duration (hour)	-0.147	< 0.001
Daytime sleep duration (hour)	-0.112	0.004
Number of waking at night	0.719	< 0.001
Night waking duration (hour)	0.221	< 0.001
Nocturnal sleep latency (hour)	0.589	< 0.001
Sleep onset time (hour)	0.133	0.001

Abbreviations ISQ: infant sleep questionnaire, r_s: Spearman correlation