Table 3.

Association of sleep duration and WC.

Exposure	Model 1 β (95%CI)	Model 2 β (95%CI)	Model 3 β (95%CI)
Sleep duration	−0.51 (−0.70, −0.33) p < 0.0001	−0.54 (−0.73, −0.36) p < 0.0001	−0.36 (−0.53, −0.19) p < 0.0001
Sleep duration classification
<7 h	Reference	Reference	Reference
7–9 h	−1.62 (−2.14, −1.09) p < 0.0001	−1.67 (−2.19, −1.15) p < 0.0001	−0.80 (−1.28, −0.31) p = 0.0012
>9 h	−1.81 (−3.52, −0.09) p = 0.0390	−1.85 (−3.52, −0.17) p = 0.0308	−2.78 (−4.33, −1.24) p = 0.0004
P for trend	<0.001	<0.001	<0.001

Model 1: Not adjusted for covariates; Model 2: Adjusted for age, gender, and race; Model 3: Adjusted for age, gender, race, education, marital status, family PIR, alcohol status, smoke status, moderate work activity, moderate recreational activities, diabetes, hypertension. PIR, poverty income ratio; WC, waist circumference.