Table 4.
Association between abnormal prepregnancy BMI and unrecommended gestational weight gain compared with normal-weight participants within IOM adherence guidelines among PPG (1978–1993) and CSL (2002–2008) study cohorts
| Model I | Model II | Model III | |
| OR (95% CI) | OR (95% CI) | OR (95% CI) | |
| PPG | |||
| Prepregnancy BMI | – | ||
| Normal/underweight | 1.00 (reference) | 1.00 (reference) | – |
| Overweight/obese | 1.28 (0.70 to 2.32) | 1.44 (0.79 to 2.63) | – |
| Gestational weight gain | |||
| Under | 0.71 (0.39 to 1.31) | 0.76 (0.41 to 1.41) | 0.76 (0.41 to 1.42) |
| Within | 1.00 (reference) | 1.00 (reference) | 1.00 (reference) |
| Over | 1.57 (0.92 to 2.65) | 1.55 (0.90 to 2.67) | 1.53 (0.86 to 2.71) |
| CSL | |||
| Prepregnancy BMI | – | ||
| Underweight | 0.33 (0.04 to 2.92) | 0.38 (0.03 to 4.21) | – |
| Normal | 1.00 (reference) | 1.00 (reference) | – |
| Overweight | 1.12 (0.67 to 1.87) | 1.32 (0.77 to 2.26) | – |
| Obese | 0.79 (0.46 to 1.36) | 1.04 (0.58 to 1.86) | – |
| Gestational weight gain | |||
| Under | 0.69 (0.33 to 1.43) | 0.75 (0.35 to 1.60) | 0.73 (0.34 to 1.58) |
| Within | 1.00 (reference) | 1.00 (reference) | 1.00 (reference) |
| Over | 1.62 (0.97 to 2.72) | 1.54 (0.91 to 2.63) | 1.46 (0.84 to 2.52) |
BMI was defined as: underweight (BMI <18.5 kg/m2); normal (18.5 kg/m2≤BMI<25.0 kg/m2); overweight (25.0 kg/m2≤BMI<30.0 kg/m2); obese (BMI ≥30.0 kg/m2).
Model I: adjusted for age.
Model II: adjusted for model I+maternal race, parity, pre-eclampsia.
Model III: adjusted for model II+prepregnancy BMI.
BMI, body mass index; CSL, Consortium on Safe Labor; IOM, Institute of Medicine; PPG, Diabetes in Pregnancy Program Project.