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Table 1 Sociodemographic characteristics of women in the different BMI groups

From: Effect of Body Mass Index on pregnancy outcomes in nulliparous women delivering singleton babies

Characteristics

Underweight

BMI < 20

n = 2842

Normal

BMI = 20–24.9

n = 14076

Overweight

BMI = 25–29.9

n = 5308

Obese

BMI = 30–34.9

n = 1858

Morbidly Obese

BMI > 35

n = 157

Age at delivery (years)

24.8 (5.2)*

26.4(5.2)

26.8(5.2)

26.8(5.1)

28.3(5.3)*

Height (cm)

163.0(6.5)

162.5(6.3)

162.2(6.4)

162.2(6.4)

162.4(6.0)

Weight (Kg)

50.1(4.6)

59.2(5.7)

70.9(6.7)

87.3(9.5)

114.1(11.2)

BMI (Kg/m2)

18.8 (0.9)

22.4(1.3)

26.9(1.4)

33.2(2.5)

43.3(3.7)

Booking week

10.7(2.6)

10.8(2.6)

10.6(2.7)

10.2(2.7)

9.7(2.8)

Married or cohabiting

2201(77.4%)*

11848(84.2%)

4449(83.8%)

1522(81.9%)

125(79.6%)*

Husband/partner's social class I/II

662(23.3%)*

3771(26.8%)

1227(23.1%)*

358(19.3%)*

24(15.3%)*

Smoking

1208(42.5%)*

4832(34.3%)

1691(31.9%)*

568(30.6%)*

32(20.4%)*

Type I Diabetes

0(0%)

27(0.2%)

40(0.8%)*

5 (0.3%)

3(1.9%)*

  1. Values expressed as mean (SD) median (IQR) or number (per cent)
  2. * P value less than 0.05