Table 3.

Nonlinear Model Results

Term	B	SE	t	df	p	β
Intercept	0.23	0.01	40.99	17,837	<.001
Sleep hours: less than 4.5 vs. 4.5 to 5.5	−0.06	0.01	−4.90	17,837	<.001	−0.17
Sleep hours: 4.5 to 5.5 vs. 5.5 to 6.5	−0.03	0.01	−4.07	17,837	<.001	−0.10
Sleep hours: 5.5 to 6.5 vs. 6.5 to 7.5	−0.02	0.01	−3.90	17,837	<.001	−0.07
Sleep hours: 6.5 to 7.5 vs. 7.5 to 8.5	−0.02	0.00	−3.99	17,837	<.001	−0.06
Sleep hours: 7.5 to 8.5 vs. 8.5 to 9.5	−0.01	0.01	−1.08	17,837	.279	−0.02
Sleep hours: 8.5 to 9.5 vs. 9.5 to 10.5	0.01	0.01	0.80	17,837	.423	0.03
Sleep hours: 9.5 to 10.5 vs. more than 10.5	0.09	0.02	4.01	17,837	<.001	0.26
Sample	0.00	0.01	0.22	2,799	.826	0.01
Age	0.00	0.00	−7.56	2,799	<.001	−0.12
Gender	0.03	0.01	3.31	2,799	.001	0.10
Race	−0.03	0.01	−2.30	2,799	.022	−0.09

Note: N = 2,804 combined across Samples 1 and 2. All between-person difference variables (sample, age, gender, race) were grand-mean centered. Boldface indicates statistical significance with alpha of .05.