Table 3.

Predicted probabilities of weight status and weight-related behaviors by weekend night-school night sleep timing difference

		Weekend Night-School Night Sleep Timing Differenceb
	n	<1 hours	≥1 to <2 hours	≥2 to <3 hours	≥3 hours	pa (df=3)
Weight status
BMI z-score ≥85th percentilec	224	15.6%	18.0%	10.7%	18.2%	0.49
BMI z-score ≥95th percentilec,d	233	10.0%	9.1%	4.8%	15.2%	0.26
Eating behaviors
Eat breakfast 5 days/week	225	63.8%	53.3%	58.8%	57.4%	0.72
Eat supper with family 5–7 days a week	228	59.0%	54.6%	58.3%	39.4%	0.32
Food consumption
Fruit or vegetables daily	228	72.5%	66.2%	72.2%	66.3%	0.78
Fast food weekly	227	61.9%	67.6%	72.3%	71.1%	0.67
Physical activity
Active 6–7 days/week	227	51.9%	41.9%	49.9%	59.6%	0.41
Moderate-strenuous activity ≥7 hours/week	227	49.1%	34.6%	45.4%	55.2%	0.18
Beverage consumption (mean times/day)
Sugar-sweetened beverages	228	1.4	1.2	1.2	1.4	0.93
Caffeinated beverages	228	0.4	0.6	0.4	0.7	0.53

BMI = body mass index; df = degrees of freedom

Bold text indicates p ≤0.05

^aRegression models adjusted for age, sex, free or reduced-price lunch eligibility, and racial/ethnic categorization (non-Hispanic white vs Hispanic or not white); school ID included as a random effect due to students nested within schools.

^bWeekend night-school night sleep timing difference refers to the difference in weekend night and school night sleep timing (weekend night midpoint – school night midpoint), so that a positive difference corresponds to later midpoint on weekend nights than school nights and a negative difference corresponds to an earlier midpoint on weekend nights.

^cObjective height/weight data used when available.

^dModel with 95^th percentile BMI outcome not adjusted for free/reduced lunch eligibility due to convergence issues.