From: Trends in caesarean section and instrumental deliveries in relation to Body Mass Index: a clinical survey during 1978 - 2001
BMI < 20
BMI 20-24.9
BMI > = 25
Mean
N
1978
2905
14
332
34
3916
6
1986
3120
15
3047
42
3320
16
1992
3293
9
3407
61
3523
45
1997
3110
3533
28
3629
23
2001
1994
10
2981
77
84