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Table 3 Multinomial logistic regression of sleep duration (N = 1578)

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

  All Men Women
Short sleep
AOR (95% CI)a
Long sleep
AOR (95% CI)a
Short sleep
AOR (95% CI)a
Long sleep
AOR (95% CI)a
Short sleep
AOR (95% CI)a
Long sleep
AOR (95% CI)a
Race/nationality
 Whites Reference Reference Reference Reference Reference Reference
 Blacks 1.74 (1.20, 2.51)** 0.85 (0.43, 1.69) 2.22 (1.34, 3.68)** 0.93 (0.35, 2.46) 1.28 (0.70, 2.35) 0.59 (0.19, 1.84)
 Koreans 0.97 (0.69, 1.36) 0.78 (0.43, 1.41) 1.05 (0.68, 1.61) 0.79 (0.38, 1.65) 0.91 (0.50, 1.68) 0.52 (0.16, 1.65)
BMI
 Underweight 0.86 (0.39, 1.93) 1.44 (0.39, 5.30) 0.69 (0.16, 2.94) 0.25 (0.17, 3.95) 1.00 (0.36, 2.77) 2.40 (0.56, 10.36)
 Normal weight Reference Reference Reference Reference Reference Reference
 Overweight 1.52 (1.16, 1.99)** 1.17 (0.67, 2.03) 1.48 (1.06, 2.07)* 1.10 (0.56, 2.19) 1.58 (0.97, 2.56) 1.42 (0.53, 3.78)
 Obesity 1.67 (1.16, 2.41)** 1.79 (1.03, 3.43)* 1.61 (1.04, 2.74)* 1.68 (0.69, 4.09) 1.84 (1.07, 3.16)* 1.74 (0.62, 4.86)
  Whites Blacks Koreans
Short sleep
AOR (95% CI)a
Long sleep
AOR (95% CI)a
Short sleep
AOR (95% CI)a
Long sleep
AOR (95% CI)a
Short sleep
AOR (95% CI)a
Long sleep
AOR (95% CI)a
Gender
 Men Reference Reference Reference Reference Reference Reference
 Women 1.36 (0.72, 2.56) 1.20 (0.42, 3.44) 0.95 (0.61, 1.47) 1.12 (0.44, 2.83) 1.08 (0.72, 1.63) 0.80 (0.34, 1.90)
BMI
 Underweight 0.82 (0.04, 18.08) 1.45 (0.91, 4.27) 0.22 (0.02, 2.09) 3.14 (0.28, 34.53) 1.19 (0.44, 3.19) 1.40 (0.26, 7.46)
 Normal weight Reference Reference Reference Reference Reference Reference
 Overweight 1.51 (0.77, 2.97) 1.73 (0.60, 5.02) 1.70 (1.06, 2.72)* 1.30 (0.43, 3.92) 1.30 (0.86, 1.97) 0.73 (0.28, 1.89)
 Obesity 1.67 (0.71, 3.92) 2.63 (0.71, 9.77) 1.68 (1.01, 2.84)* 2.25 (0.80, 6.27) 1.10 (0.43, 2.77) 0.46 (0.05, 4.00)
  1. Sleep duration classified into short sleep (< 7 h/night), normal sleep (7–9 h/night), and long sleep (> 9 h/night)
  2. 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
  3. aOdds ratio adjusted for age, annual family income, days of vigorous-intensity activity, days of moderate-intensity activity, current smoking status, days of alcohol use, having trouble sleeping, sleep disorder, and depression
  4. AOR adjusted odds ratio, CI confidence interval
  5. *p < .05; **p < .01