Relationship between sleep and obesity among U.S. and South Korean college students

BMC Public Health

Table 4 Poisson regression of getting enough sleep in the past 7 days (N = 1578)

	All IRR (95% CI)^a	Men IRR (95% CI)^a	Women IRR (95% CI)^a	Whites IRR (95% CI)^a	Blacks IRR (95% CI)^a	Koreans IRR (95% CI)^a
Race/nationality
Whites	Reference	Reference	Reference	–	–	–
Blacks	0.89 (0.81, 0.98)^*	0.85 (0.75, 0.96)^**	0.99 (0.84, 1.15)	–	–	–
Koreans	0.79 (0.73, 0.86)^***	0.77 (0.70, 0.85)^***	0.82 (0.70, 0.95)^*	–	–	–
Gender
Men	Reference	–	–	Reference	Reference	Reference
Women	0.92 (0.86, 0.99)^*	–	–	0.79 (0.68, 0.91)^**	1.00 (0.90, 1.12)	0.91 (0.82, 1.02)
BMI
Underweight	0.88 (0.71, 1.09)	0.92 (0.62, 1.35)	0.92 (0.70, 1.20)	0.98 (0.48, 1.97)	1.06 (0.67, 1.67)	0.92 (0.68, 1.12)
Normal weight	Reference	Reference	Reference	Reference	Reference	Reference
Overweight	0.96 (0.89, 1.03)	0.95 (0.87, 1.03)	0.95 (0.83, 1.08)	0.92 (0.79, 1.08)	0.99 (0.87, 1.12)	0.97 (0.87, 1.08)
Obesity	0.92 (0.85, 0.99)^*	0.91 (0.82, 1.01)	0.90 (0.79, 1.03)	0.86 (0.70, 1.06)	0.90 (0.78, 1.04)	0.97 (0.86, 1.09)

Underweight (BMI < 18.5), normal weight (18.5 ≤ BMI < 25.0), overweight (25.0 ≤ BMI < 30.0), and obesity (BMI ≥ 30.0) for whites and blacks. Underweight (BMI < 18.5), normal weight (18.5 ≤ BMI < 23.0), overweight (23.0 ≤ BMI < 25.0), and obesity (BMI ≥ 25.0) for Koreans
^aIncidence rate ratio (IRR) adjusted for age, current smoking status, days of alcohol use, and depression
CI confidence interval
^*p < .05; ^**p < .05; ^***p < .001

ISSN: 1471-2458