Factors

Relative risk

95% Confidence Interval

P value

Referred of patients

Yes

No

1.2

0.94 - 1.52

<0.01

Body Mass Index

18 - 25

26 - 40

1.11

0.86 - 1.42

<0.01

Genital bleeding

Yes (n = 892)

No (n = 4371)

1.5

1.1 - 1.9

<0.01

Prolonged labor

Yes (n = 1135)

No (n = 4128)

1.38

1.05 - 1.81

<0.01

Type of anesthesia

General

Loco-regional

1.55

1.18 - 2.05

>0.01

Context of caesarean

Emergency (n = 4423)

No emergency (n = 840)

2.05

1.35 - 3.11

<0.01

Type of skin incision

Median incision (n = 647)

Transversal incision (n = 4616)

1.35

0.97 - 1.87

>0.01

Blood loss

Less than 1000 ml (n = 4112)

More than 1000 ml (n = 1151)

0.97

0.73 - 1.29

>0.01

Length of caesarean

Less than 60 minutes (n = 3845)

More than 60 minutes (n = 1418)

3.00

1.89 - 4.90

<0.01