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Table 7 BMI categories at 18 months post-partum in relation to prepregnant BMI and gestational weight gain (GWG) according to IOM recommendations in 19 604 nulliparous and 16 593 parous given as percentage (%) of each prepregnant weight class

From: Associations of pre-pregnancy body mass index and gestational weight gain with pregnancy outcome and postpartum weight retention: a prospective observational cohort study

Prepregnant BMI categories

GWG < IOM rec.

GWG = IOM rec

GWG > IOM rec.

Underw.

Normal w.

Overw.

Obese

Underw.

Normal w.

Overw.

Obese

Underw.

Normal w.

Overw.

Obese

Nulliparous

            

  Underweight

65.1

33.7

1.2

0

46.7

53.0

0.3

0

26.1

68.8

5.1

0

  Normal weight

2.8

88.1

9.0

0.1

1.7

86.1

12.0

0.2

0.7

74.4

23.5

1.4

  Overweight

0

22.6

60.8

10.7

0.1

21.9

66.4

11.6

0

10.9

67.8

21.2

  Obese

0

0.9

18.9

80.2

0

0.6

15.0

84.3

0

0.7

13.5

85.9

Parous

            

  Underweight

66.9

33.1

0

0

55.2

44.3

0.5

0

36.6

63.4

0

0

  Normal weight

1.8

90.1

8.0

0.1

1.3

89.1

9.4

0.1

0.4

82.0

17.0

0.5

  Overweight

0

28.8

69.9

8.3

0

19.5

72.0

8.5

0

14.9

71.1

14.0

  Obese

0

1.6

18.9

79.5

0

0.8

20.3

78.9

0

0.8

21.1

78.0

  1. The bold text indicates the percentage of women belonging to the same weight class 18 mo. postpartum as before pregnancy.