Table 5.

Daytime sleep duration for ADHD cases and rest of cohort

	ADHD cases			Rest of cohort
Time point (months)	N	Mean	SD	N	Mean	SD	P-value*
6	164	2 h 20 min	1 h 08 min	7573	2 h 21 min	1 h 03 min	0.81
18	156	1 h 22 min	0 h 38 min	7431	1 h 27 min	0 h 32 min	0.04
30	143	0 h 41 min	0 h 44 min	6986	0 h 43 min	0 h 44 min	0.55
42	147	0 h 15 min	0 h 33 min	7143	0 h 14 min	0 h 31 min	0.80
69	146	0 h 3 min	0 h 16 min	7056	0 h 01 min	0 h 09 min	0.03
81	143	0 h 1 min	0 h 13 min	7048	0 h 0.5 min	0 h 07 min	0.18

ADHD, attention deficit hyperactivity disorder.

^*t-test.