Table 3.

Longitudinal association of weekday sleep duration at age 8–11 with BMIz in adolescence, stratified by sex

Subject characteristics at age 8–11	BMIz in early adolescence (age 12–15)						BMIz in late adolescence (age 16–19)
	Model 1			Model 2			Model 3			Model 4
	β	SE	p-val	β	SE	p-val	β	SE	p-val	β	SE	p-val
Boys (n=157)
Sleep duration	−0.32	0.12	0.01	−0.08	0.08	0.33	−0.30	0.13	0.02	−0.06	0.08	0.47
Age	−0.14	0.13	0.28	0.02	0.08	0.78	0.07	0.23	0.75	0.11	0.15	0.45
Time to follow-up	0.01	0.16	0.94	−0.04	0.10	0.69	0.35	0.28	0.21	0.15	0.17	0.38
African-American	0.13	0.27	0.65	−0.18	0.18	0.29	0.35	0.28	0.21	0.04	0.18	0.82
Low birth weight	−0.23	0.18	0.22	0.09	0.12	0.45	−0.13	0.19	0.49	0.20	0.12	0.09
Low SES	0.05	0.24	0.84	0.34	0.15	0.03	−0.37	0.24	0.13	−0.05	0.15	0.72
BMIz	--	--	--	0.78	0.05	<0.001	--	--	--	0.81	0.05	<0.001
Girls (n=156)
Sleep duration	−0.11	0.10	0.27	−0.01	0.07	0.89	−0.07	0.10	0.49	0.03	0.07	0.64
Age	−0.11	0.17	0.51	−0.14	0.12	0.24	−0.14	0.17	0.42	−0.16	0.12	0.17
Time to follow-up	−0.29	0.19	0.14	−0.18	0.13	0.16	−0.27	0.19	0.15	−0.17	0.13	0.19
African-American	0.33	0.23	0.16	0.34	0.15	0.03	0.29	0.23	0.21	0.31	0.16	0.05
Low birth weight	−0.25	0.15	0.10	−0.01	0.10	0.99	−0.22	0.15	0.15	0.03	0.10	0.77
Low SES	0.51	0.21	0.02	0.22	0.14	0.13	0.39	0.21	0.06	0.10	0.14	0.46
BMIz	--	--	--	0.55	0.04	<0.001	--	--	--	0.55	0.04	<0.001

Overall Model R²: Model 1 = 0.06; Model 2 = 0.62; Model 3 = 0.07; Model 4: 0.65.

Sleep Duration Partial R²: Model 1 = 0.04; Model 2 < 0.01; Model 3 = 0.03; Model 4: <0.01.

Overall Model R²: Model 1 = 0.16; Model 2 = 0.63; Model 3 = 0.12; Model 4: 0.60.

Sleep Duration Partial R²: Model 1 = 0.01; Model 2 < 0.01; Model 3 < 0.01; Model 4: <0.01.