Table 4.

Linear Regression Model Predicting BMI Percentile^a from Social Jetlag (N = 3,060)

Predictor	b	95%CI	Model R2	ΔR2
Model 1 (unadjusted)
Social jetlag (hrs)b	1.01*	.24, 1.77	< .01	.002
Model 2 (+ covariatesc)
Social jetlag (hrs)b	.98*	.21, 1.75	.01	.002
Model 3 (+ school night sleep duration)
Social jetlag (hrs)b	.93*	.15, 1.70	.01	.002
School night sleep duration (hrs)	−.48	−1.28, .32		< .001
Model 3e (+ eating behaviours)
Social jetlag (hrs)a	.84*	.05, 1.62		.001
School night sleep duration (hrs)	−.25	−1.06, .55		< .001
Breakfast ≥ 4 days of school week	−3.88***	−5.90, −1.85	.02	.005
Fruits/vegetables 7 days of week	−.87	−3.02, 1.29		< .001
Fast food ≥ 2 days of week	−1.20	−3.24, .84		< .001
≥ 2 sweetened drinks daily	.94	−1.15, 3.04		< .001
Model 4 (+ ethnicityd)
Social jetlag (hrs)a	.72	−.06, 1.50		.001
School night sleep duration (hrs)	−.24	−1.05, .56		< .001
Breakfast ≥ 4 days of school week	−3.85***	−5.87, −1.84		.005
Fruits/vegetables 7 days of week	−.27	−2.42, 1.89	.03	< .001
Fast food ≥ 2 days of week	−1.76	−3.79, .28		.001
≥ 2 sweetened drinks daily	.29	−1.81, 2.39		< .001
Black, non-Hispanic/Latino	7.73***	4.85, 1.61		.019
Hispanic and/or Latino	8.44***	5.30, 11.58		.017
Other,e mixed, or none	2.93	−.74, 6.61		.001

b, unstandardized beta; CI, confidence interval.

^aCalculated based on 2000 Centers for Disease Control and Prevention (CDC) growth charts, matched for age and sex.⁽⁴⁸⁾

^bCalculated as | midpoint of sleep on weekend nights − midpoint of sleep on school nights |.⁽¹³⁾

^cCovariates include sex, age, youth living arrangements, and household income level.

^dCategories include White, non-Hispanic/Latino (reference group), Black, non-Hispanic/Latino, Hispanic and/or Latino (any race), or Other, Mixed, or None.

^eOther category includes Asian, Central American/Caribbean, Native American/Alaska Native, and/or Native Hawaiian/Pacific Islander.

^*p < .05.

^***p < .001.