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

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

  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)
  1. 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
  2. aIncidence rate ratio (IRR) adjusted for age, current smoking status, days of alcohol use, and depression
  3. CI confidence interval
  4. *p < .05; **p < .05; ***p < .001