. Author manuscript; available in PMC: 2010 Mar 1.

Published in final edited form as: J Pediatr. 2008 Oct 11;154(3):426–430.e1. doi: 10.1016/j.jpeds.2008.08.035

Table 2.

Age-, race- and sex-adjusted means ± standard errors of bed time, wake time and time in bed for respondents aged 15–17 years from the 1981 Time Use Longitudinal Panel Study and the 2003 through 2006 American Time Use Surveys.

	1981	2003	2004	2005	2006

n	130	961	655	619	743
Bed time on school days	22:21±0:10	22:16± 0:14	22:34± 0:14	22:18±0:16	22:18±0:14
Bed time on non school days	23:01±0:24	22:39± 0:14	22:51±0:17	22:48±0:21	22:42±0:15
Wake Time on school days	6:32±0:09	6:28± 0:08	6:25± 0:07	6:21± 0:06	6:31± 0:08
Wake Time on non school days	8:58±0:21	9:39± 0:15	9:44± 0:33	9:27± 0:21	9:25± 0:19
Time in bed on school days	8:15±0:11	8:13±0:15	7:51±0:15	8:03±0:15	8:14±0:16
Time in bed on non school days	9:51±0:30	10:54±0:19	10:54±0:42	10:46±0:32	10:46±0:20