Table 2

Pregnancy, labour and delivery characteristics of women in each BMI group

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


Pre-eclampsia*

82(3.3%)

572(5.0%)

313(8.1%)

181(14.7%)

29(28.2%)

Gestational hypertension*

374(13.6%)

2662(19.7%)

1422(28.5%)

624(37.2%)

54(42.2%)

Abruptio placentae

12(0.4%)

83(0.6%)

31(0.6%)

13(0.7%)

3(1.9%)*

Placenta praevia

10(0.4%)

25(0.2%)

11(0.2%)

3(0.2%)

0(0%)

Induced labour*

683(24.0%)

3832(27.2%)

1771(33.4%)

796(42.8%)

77(49.0%)

Instrumental delivery

773(27.2%)

4040(28.7%)

1499(28.2%)

465(25.0%)

38(24.2%)

Total C-Section*

320(11.3%)

2305(16.4%)

1279(24.1%)

573(30.8%)

67(42.7%)

Elective C-section

73(2.6%)

487(3.5%)

221(4.2%)

88(4.7%)*

16(10.2%)*

Emergency CS*

247(8.7%)

1818(12.9%)

1058(19.9%)

488(26.3%)

51(32.5%)

Mean blood loss (mls)*

254.5 (6.9)

290.4 (5.7)

333.6(8.5)

400.5(7.2)

456.4(25.7)

Postpartum haemorrhage*

192(6.8%)

1356(9.5%)

708(13.3%)

369(19.9%)

37(23.6%)

Preterm delivery (< 37 weeks)

345(12.1%)*

1537(10.9%)

573(10.8%)

243(13.1%)*

32(20.4%)*

Preterm delivery (< 33 weeks)

58(2.0%)

331(2.4%)

122(2.3%)

77(4.1%)*

10(6.4%)*

Spontaneous preterm(< 37 wks)

244(8.5%)*

964(6.8%)

325(6.1%)

124(6.6%)

12(7.6%)*

Post term delivery (> 41 weeks)

108(3.8%)*

773(5.5%)

350 (6.6%)*

136(7.3%)*

7(4.5%)

Stillbirth

22(0.8%)

131(0.9%)

57(1.1%)

35(1.9%)*

4(2.5%)*

Birth weight < 2500 g

269(9.5%)*

980(7.0%)

327(6.2%)

142(7.6%)

19(12.1%)*

Birth weight > 4000 g*

100(3.5%)

1072(7.6%)

564(10.6%)

255(13.7%)

25(15.9%)


Values expressed as number (per cent) or mean (Std. dev.)

*P value less than 0.05

Bhattacharya et al. BMC Public Health 2007 7:168   doi:10.1186/1471-2458-7-168

Open Data