Table 1 Comparison of women’s preexisting characteristics and obstetric characteristics between the unoperated and operated group, n = 576

Age (years)

0.04

 ≤ 35

121

(41.3)

94

(33.2)

 > 35

172

(58.7)

189

(66.8)

BMI^a (kg/m²)

0.43

 < 25

158

(53.9)

157

(56.1)

 [25–30[

78

(26.6)

80

(28.6)

 ≥ 30

57

(19.4)

43

(15.4)

Geographical origin,

0.16

 France

69

(23.6)

72

(25.4)

 Sub-Saharan Africa

114

(38.9)

126

(44.5)

 Other origins

110

(37.5)

85

(30.0)

Low socioeconomic status^b,

130

(44.7)

125

(45.8)

0.79

Parity

< 0.01

 Nulliparous

204

(68.6)

157

(55.5)

 Multiparous with no history of cesarean

55

(18.8)

16

(5.6)

 Multiparous with history of cesarean

34

(11.6)

110

(38.9)

History of preterm delivery if multiparous

13

(4.4)

26

(9.2)

0.02

 Diabetes

4

(1.4)

5

(1.8)

0.70

 High blood pressure

10

(3.4)

6

(2.1)

0.34

Use of ART^c

40

(13.7)

80

(28.3)

< 0.01

 High blood pressure or preeclampsia

33

(11.3)

30

(10.6)

0.80

 Gestational diabetes

52

(17.7)

60

(21.2)

0.29

 Small for gestational age

26

(8.9)

17

(6.0)

0.19