Table 3.
Incidence of term preeclampsia (%) per category of adequate or non-adequate gestational weight gain (GWG; adequate GWG as reference)
| Differences with adequate weight gain | Non-overweight <25 kg/m² (%) n=35 402 |
OR 95% CI |
P value | Overweight 25–29.9 kg/m² (%) n=12 369 |
OR 95% CI |
P value |
| −10 kg and lower | 20/4465 (0.4) | 0.50 (0.3 to 0.82) |
0.003 | 0/259 (0.0) |
– | – |
| −3 to 9 kg | 97/17 759 (0.5) | 0.61 (0.45 to 0.86) |
0.002 | 23/2807 (0.8) |
1.4 | 0.12 |
| Adequate GWG±2 kg | 66/7456 (0.88) | Reference | – |
20/3471 (0.57) |
Reference | – |
| +3 to 9 kg | 70/5063 (1.4) | 1.57 (1.1 to 2.2) |
0.004 | 58/4604 (1.3) |
2.2 (1.3 to 3.7) |
<0.0001 |
| 10 kg+ | 23/679 (3.4) | 3.9 (2.4 to 6.3) |
<0.0001 | 23/679 (3.4) |
4.6 (2.6 to 8.2) |
<0.0001 |
| Differences with adequate weight gain |
Obese 30–34.9 kg/m² (%) n=6019 |
OR 95% CI |
P value |
Severe obese ≥35 kg/m² (%) n=3913 |
OR 95% CI |
P value |
| −10 kg and lower | 0/65 (0.0) | – | – | 0/13 (0.0) |
– | – |
| −3 to 9 kg | 4/545 (0.7) | 1.04 | 0.47 | 1/94 (1.1) |
1.2 | 0.43 |
| Adequate GWG±2 kg | 8/1134 (0.7) | Reference | – |
2/233 (0.86) |
Reference | – |
| +3 to 9 kg | 43/2799 (1.5) | 2.2 (1.07 to 5) |
0.02 | 24/1259 (1.9) |
2.2 | 0.13 |
| 10 kg+ | 39/1476 (2.6) | 3.8 (1.8 to 8.8) |
<0.0001 | 73/2314 (3.2) |
3.76 (1.1 to 23) |
0.02 |
All women 57 703. Observed incidence of late-onset preeclampsia (LOP): 1.04%: 603/57 703. LOP incidence in all adequate GWG 0.78% (96/12 294).