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Table 5 Results of logistic regression predicting BMI ≥ 30: Unrelated and sibling pair sample, Add Health Study, 1994–2008

From: Breastfeeding is associated with waist-to-height ratio in young adults

  Unrelated sample Sibling pair sample*
  OR 95 % CI P value OR 95 % CI P value
Sex 0.991 (0.87, 1.13) 0.897 1.114 (0.84, 1.48) 0.451
Age 1.032 (0.99, 1.08) 0.140 1.021 (0.94, 1.10) 0.613
Breastfeeding 0.854 (0.75, 0.97) 0.018 0.854 (0.64, 1.13) 0.277
Birthweight >2500 g Reference Reference Reference Reference Reference Reference
Birthweight <2500 g 1.073 (0.80, 1.44) 0.635 1.162 (0.81, 1.67) 0.419
Birthweight missing 0.614 (0.37, 1.01) 0.055 0.908 (0.43, 1.93) 0.801
Parent nonsmoker Reference Reference Reference Reference Reference Reference
Parent smoker 1.259 (1.04, 1.53) 0.021 0.909 (0.62, 1.33) 0.623
Parent smoking missing 0.863 (0.72, 1.03) 0.106 0.874 (0.61, 1.25) 0.456
Non-Hispanic African American Reference Reference Reference Reference Reference Reference
Non-Hispanic White 0.665 (0.56, 0.79) <0.0001 0.439 (0.14, 1.41) 0.168
Non-Hispanic Asian/Native American 0.528 (0.38, 0.73) <0.0001 0.682 (0.08, 5.83) 0.727
Hispanic 1.055 (0.85, 1.31) 0.621 0.738 (0.24, 2.27) 0.596
Behavioral risk score 4_1 0.794 (0.73, 0.86) <0.0001 1.244 (1.06, 1.47) 0.009
Behavioral risk score 4_2 0.834 (0.75, 0.93) 0.002 0.976 (0.83, 1.15) 0.779
Behavioral risk score 4_3 0.867 (0.77, 0.98) 0.018 0.904 (0.75, 1.09) 0.283
Parent socioeconomic status 0.960 (0.94, 0.98) 0.002 0.652 (0.49, 0.86) 0.003
Maternal obesity 2.539 (2.17, 2.97) <0.0001 2.794 (2.08, 3.75) <0.0001
Genetic risk score 1.092 (1.05, 1.14) <0.0001
  1. OR (Odds Ratio), 95 % CI (95 % Confidence Interval)
  2. *The analyses for the paired sample also controlled for genetic ancestry which is not displayed in the above table