Table 6.

Mixed-effects linear regression model of sleep onset latency time in minutes by type of assessment (habitual, AM estimated, and PSG) and by predictive variables

Variables	Regression coefficient	p-value	95% CI*
Habitual	0.98	0.552	0.93–1.04
AM Estimated	1.29	<0.0001	1.22–1.37
Female sex	1.14	<0.0001	1.07–1.22
Ethnicity, other than Caucasian	1.16	0.001	1.06–1.27
12–16 yr of education	0.93	0.179	1.18–1.03
>16 yr of education	0.83	<0.002	0.74–0.94
Any Heart Disease	1.15	0.001	1.06–1.24
Intercept	15.5	<0.0001	13.8–17.4

^*CI = confidence interval. Note: Values for habitual, am estimated, and polysomnogram sleep onset latency time were log transformed for this test, anti-log values are presented here. PSG is the reference category for type of assessment, male is the reference category for sex, Caucasian is the reference category for ethnicity, <12 years of education is the reference category for education, no heart disease is the reference category for any heart disease, and Pacific/Eastern is the reference category for time zone.