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Table 5 Weekly weight gain in the third trimester by BMI class for all term singleton births and for births without complications

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 weekly GWG ± SEM in the third trimester (lb/week) Proportion above IOM recommendations
All births   12,912 1.06 ± 0.01 64.5%
 Underweight 1–1.3 371 1.05 ± 0.03 28.6%
 Normal weight 0.8–1.0 5085 1.12 ± 0.01 56.8%
 Overweight 0.5–0.7 3230 1.12 ± 0.01 75.9%
 Obese class I 0.4–0.6 2028 0.98 ± 0.02 71.8%
 Obese class II 0.4–0.6 1230 0.89 ± 0.02 65.0%
 Obese class III 0.4–0.6 968 0.90 ± 0.03 64.4%
Births with no complications   6473 1.11 ± 0.01 65.3%
 Underweight 1–1.3 220 1.03 ± 0.03 25.9%
 Normal weight 0.8–1.0 3098 1.14 ± 0.01 58.0%
 Overweight 0.5–0.7 1666 1.17 ± 0.02 79.6%
 Obese class I 0.4–0.6 837 1.04 ± 0.03 74.3%
 Obese class II 0.4–0.6 420 0.87 ± 0.03 65.5%
 Obese class III 0.4–0.6 232 0.96 ± 0.09 63.8%