Table 2 Rate of pre-existing medical or obstetric complicating factors for adverse antenatal outcome, stratified by body mass index group
BMI (kg/m2) | Women with early pregnancy complicating factors | Women without early pregnancy complicating factors | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|
Pre-existing medical complicating factor(s) | Obstetric complicating factor(s) | Pre-existing medical and/or early obstetric factors (subtotal) | |||||||
n | % | n | % | n | % | n | % | n | |
< 18·5 | 2124 | 5·4 | 5365 | 13·6 | 7070 | 17·9 | 32,336 | 82·1 | 39,406 |
18·5–24·9 | 17,290 | 5·0 | 42,762 | 12·4 | 57,038 | 16·5 | 288,387 | 83·5 | 345,425 |
25·0–29·9 | 9418 | 5·9 | 19,882 | 12·5 | 27,490 | 17·3 | 131,103 | 82·7 | 158,593 |
30·0–34·9 | 5293 | 7·6 | 9193 | 13·2 | 13,465 | 19·4 | 55,918 | 80·6 | 69,383 |
35·0–39·9 | 2820 | 9·6 | 4042 | 13·8 | 6331 | 21·5 | 23,055 | 78·5 | 29,386 |
40·0–49·9 | 1884 | 11·7 | 2251 | 14·0 | 3754 | 23·4 | 12,285 | 76·6 | 16,039 |
50·0+ | 312 | 12·9 | 372 | 15·3 | 607 | 25·0 | 1821 | 75·0 | 2428 |