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

Published in final edited form as: Psychoneuroendocrinology. 2009 Mar 5;34(7):1029–1040. doi: 10.1016/j.psyneuen.2009.02.002

Table II. T-tests of sleep time (min) during daily periods.

Mean and group comparisons of sleep time in the two groups of animals across different time intervals. The daily interval is the entire 24hr period. Lights-off is from 1800h-0600h. Lights-on is from 0600h–1800h. The morning and evening lights-on periods are from 0600h–1200h and 1200h–1800h, respectively. NS indicates a nonsignificant (p>0.05) two-sample t-test.

	Mother-reared	Nursery-reared	T-value	df	p-value

Daily Period	929.9	960.1	−1.30	14	NS
Lights-off Period	684.2	677.9	1.02	14	NS
Lights-on Period	226.3	277.1	−3.32	14	*<0.01*
Morning Lights-on Period	82.7	123.0	−3.28	14	*<0.01*
Evening Lights-on Period	143.6	154.0	−1.06	14	NS