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Table 3 The proportion of women with GWG above recommendations by maternal BMI class and weeks of completed gestation. Both week of gestation and BMI class were significant factors for GWG above recommendations

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

Gestational age All women Underweight Normal weight Overweight Obese
370–376 667 12 213 212 230
weeks (47.1%) (26.7%) (37.0%) (60.6%) (47.1%)
380–386 1247 20 421 394 412
weeks (47.5%) (22.5%) (38.6%) (61.6%) (51.2%)
390–396 3577 61 1116 1101 1299
weeks (51.0%) (28.6%) (42.2%) (63.6%) (53.5%)
400–406 2876 49 1037 972 818
weeks (56.0%) (32.7%) (48.4%) (70.1%) (56.2%)
410–416 1263 20 480 389 374
weeks (62.4%) (37.0%) (56.4%) (75.2%) (62.1%)