Association of Sleep Duration with Obesity among US High School Students

Table 4

Odds ratios for obesity, ^aby sleep duration—US female high school students.

Independent variables	(𝑁=11,939)	%	OR	95% CI	AOR	95% CI
Sleep duration (hours)^b
≤4	(665)	14.6	2.10	1.47−2.99	1.50	1.05−2.15
5	(1,401)	10.3	1.41	1.06−1.88	1.17	0.87–1.58
6	(2,842)	8.3	1.10	0.87−1.39	1.00	0.78–1.27
7	(3,522)	7.5	1.00	(referent)	1.00	(referent)
8	(2,650)	8.3	1.11	0.87−1.42	1.11	0.86–1.43
9	(657)	12.1	1.69	1.17−2.42	1.55	1.07–2.25
≥10	(202)	14.1	2.00	1.21−3.30	1.50	0.91–2.49
Race/ethnicity
White	(5,389)	6.8			1.00	(referent)
Black	(2,391)	15.1			2.46	1.85–3.27
Hispanic	(3,132)	11.8			1.81	1.44–2.27
Other	(1,027)	8.0			1.17	0.79–1.75
Grade
9th	(2,828)	9.0			0.89	0.70–1.12
10th	(2,860)	8.7			0.87	0.70–1.09
11th	(3,132)	8.5			0.86	0.66–1.13
12th	(3,119)	9.4			1.00	(referent)
Felt sad and hopeless^c
Yes	(4,266)	11.5			1.35	1.14–1.61
No	(7,673)	7.5			1.00	(referent)
Current smoker^d
Yes	(2,135)	12.2			1.63	1.35–1.97
No	(9,804)	8.1			1.00	(referent)
Drank nondiet soda^e
Yes	(3,303)	11.0			1.14	0.95–1.36
No	(8,636)	8.2			1.00	(referent)
Computer/video games^f
Yes	(2,438)	11.3			1.26	1.05–1.51
No	(9,501)	8.3			1.00	(referent)
Physically active^g
Yes	(1,272)	6.8			0.75	0.57–0.99
No	(10,667)	9.2			1.00	(referent)

N = unweighted sample size. OR = unadjusted odds ratio. AOR = adjusted (for other variables in the model) odds ratio. CI = confidence interval.
^aBased on self-reported height and weight, body mass index (BMI = weight [kg]/height [m]²) ≥95th percentile using growth charts developed by the Centers for Disease Control and Prevention for youth aged 2–20 years.
^bOn an average school night.
^cAlmost every day for 2 or more weeks so that they stopped doing some usual activities.
^dSmoked cigarettes on at least 1 day during the 30 days before the survey.
^eDrank a can, bottle, or glass of soda or pop, not including diet soda or diet pop, at least one time per day during the 7 days before the survey.
^fUsed a computer for something that was not school work or played video games for 3 or more hours per day on an average school day.
^gWere physically active doing any kind of physical activity that increase their heart rate and made them breathe hard some of the time for at least 60 minutes per day on all 7 days during the 7 days before the survey.