Table 4 Gestational weight gain by BMI class for all term singleton births and for births without complications. Prepregnancy BMI had a significant effect on weight gain, with mean weight gain declining with BMI (r = −0.329, P < 0.001 for all births)
IOM Recommendations (lb) | N | Mean GWG ± SEM (lb) | Proportion above IOM recommendations | |
|---|---|---|---|---|
All births | 18,217 | 30.2 ± 0.1 | 52.9% | |
Underweight | 28–40 | 551 | 35.0 ± 0.5 | 29.4% |
Normal weight | 25–35 | 7305 | 34.5 ± 0.2 | 44.7% |
Overweight | 15–25 | 4623 | 32.0 ± 0.2 | 66.4% |
Obese class I | 11–20 | 2815 | 26.0 ± 0.3 | 63.0% |
Obese class II | 11–20 | 1631 | 21.1 ± 0.4 | 50.6% |
Obese class III | 11–20 | 1292 | 17.7 ± 0.5 | 41.3% |
Births with no complications | 9487 | 31.6 ± 0.2 | 52.8% | |
Underweight | 28–40 | 340 | 34.1 ± 0.6 | 26.5% |
Normal weight | 25–35 | 4541 | 34.7 ± 0.2 | 44.8% |
Overweight | 15–25 | 2461 | 32.6 ± 0.3 | 68.0% |
Obese class I | 11–20 | 1215 | 26.8 ± 0.5 | 65.3% |
Obese class II | 11–20 | 596 | 20.0 ± 0.7 | 48.2% |
Obese class III | 11–20 | 334 | 17.1 ± 1.1 | 38.9% |