Table 3.

Univariate correlations between sleep measures and other variables.

	Sleep Duration	Wake After Sleep Onset	Perceived Sleep Quality
Hollingshead scores	.01	−.24****	.04
BMI	−0.01	−0.08	0.04
Waist/hip ratio	−0.03	0.02	0.00
Medications affecting sleep	0.18***	0.01	−0.12*
Depressive symptoms	−0.12*	0.12*	−0.35****
Proportion days during sleep study:
smoked	−0.01	0.10	−0.03
exercised	−0.08	−0.15**	0.01
drank alcohol	−0.19***	0.02	−0.02
used illegal drugs	−0.10	0.16**	−0.06
Daysleeper (yes =1)	−0.12*	0.00	−0.16**
Night Shift Worker (yes =1)	−0.18***	−0.12*	−0.12*
Less Sleep/Trouble Sleeping at age 7	−0.09	−0.08	0.10
Sleep More/Nightmares at age 7	0.03	−0.01	−0.04
Early behavior problem group (Positive=1)	0.04	0.05	0.01

^*p < .10,

^**p<.05

^***p<.01

^****p<.001

Note that correlations for perceived quality were based on data from 223 to 225 men, whereas the correlations for duration and wake after sleep onset were based on 242 to 245 men.