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Table 2 Odds ratios and 95% confidence intervervals for the associations between gestational weight gain and preterm birth overall and within strata of body mass index

From: Associations between gestational weight gain and preterm birth in Puerto Rico

   Body Mass Index
  Total Underweight Normal Overweight Obese
Gestational Weight Gain OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI)
Adjusted
  Low 1.34 (1.30, 1.37) 1.56 (1.45, 1.68) 1.39 (1.35, 1.44) 1.29 (1.21, 1.37) 1.00 (0.93, 1.07)
  Adequate Ref Ref Ref Ref Ref
  Excessive 0.99 (0.97, 1.02) 0.99 (0.89, 1.09) 1.06 (1.02, 1.10) 0.98 (0.94, 1.03) 0.94 (0.89, 0.99)
Unadjusted
  Low 1.25 (1.22, 1.28) 1.33 (1.25, 1.43) 1.32 (1.27, 1.36) 1.25 (1.18, 1.32) 0.95 (0.89, 1.01)
  Adequate Ref Ref Ref Ref Ref
  Excessive 1.15 (1.13, 1.18) 1.19 (1.09, 1.30) 1.25 (1.21, 1.29) 1.10 (1.06, 1.15) 1.03 (0.98, 1.08)
  1. Note: models adjusted for maternal age, maternal education, marital status, and birth weight for gestational age
  2. Abbreviations: OR Odds ratio, CI Confidence interval, Ref Reference