Association of Sleep Duration with Obesity among US High School Students

Table 3

Linear and quadratic associations between obesity and sleep duration—US high school students.

Demographic; subgroup (N)	Prevalence of obesity^a by sleep duration^b
	≤4 hrs	5 hrs	6 hrs	7 hrs	8 hrs	9 hrs	≥10 hrs	𝑃 Value for trend^c
	%; 95% CI; (N)	%; 95% CI; (N)	%; 95% CI; (N)	%; 95% CI; (N)	%; 95% CI; (N)	%; 95% CI; (N)	%; 95% CI; (N)	Linear	Quadratic
Total Population (23,579)	16.5 14.2–19.2 (1,355)	13.9 12.4–15.5 (2,428)	11.5 10.5–12.5 (5,306)	12.2 10.9–13.6 (7,124)	12.1 10.9–13.4 (5,513)	12.4 10.4–14.7 (1,431)	15.1 10.6–21.1 (422)	.4977	.0330
Sex
Female (11,939)	14.6 11.3–18.7 (665)	10.3 8.6–12.4 (1,401)	8.3 7.2–9.5 (2,842)	7.5 6.3–9.0 (3,522)	8.3 7.0–9.9 (2,650)	12.1 9.3–15.6 (657)	14.1 8.8–21.8 (202)	.9653	.0004
Male (11,640)	18.4 14.6–23.0 (690)	18.4 16.1–21.1 (1,027)	15.1 13.3–17.1 (2,464)	16.2 14.0–18.8 (3,602)	15.3 13.2–17.6 (2,863)	12.5 9.8–15.9 (774)	15.9 9.8–24.7 (220)	.3432	.8428

CI = confidence interval. N = unweighted sample size.
^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.
^cAdjusted for sex, race/ethnicity, grade, feeling sad and hopeless, current smoking, drinking nondiet soda or pop daily, using computers (non-school-related) or playing video games 3 or more hours per day, and being physically active for at least 60 minutes 7 days per week.