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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)

From: A retrospective study of gestational weight gain in relation to the Institute of Medicine’s recommendations by maternal body mass index in rural Pennsylvania from 2006 to 2015

  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%