Table 3. Principal delivery outcomes by level of proteinuria adjusted for age and ethnicity with risk ratios in comparison with PE 300 group (proteinuria 300- 499 mg/24 hours).
| Preeclampsia | Preeclampsia | Chronic Hypertension | Gestational Hypertension | |
|---|---|---|---|---|
| 300-499 mg/day | ≥500 mg/day | |||
| N | 60 | 161 | 615 | 110 |
| Labour onset, N (%) | ||||
| Spontaneous | 5 (8.3%) | 8 (5.0%) | 240 (39.0%)*** | 32 (29.1%)** |
| Risk ratio | 4.68 (2.01 to 10.90) | 3.49 (1.44 to 8.49) | ||
| Induction | 37( 61.7%) | 60 (37.3%) | 214 (34.8%) | 48 (43.6%) |
| Risk ratio | 0.60 (0.46 to 0.81)*** | 0.56 (0.45 to 0.71)*** | 0.71 (0.53 to 0.95)* | |
| Pre-labour caesarean section | 18 (30.0%) | 93 (57.8%) | 161 (26.2%) | 30 (27.3%) |
| Risk ratio | 1.93 (1.28 to 2.90)** | 0.87 (0.58 to 1.31) | 0.91 (0.56 to 1.49) | |
| Delivery mode, N (%) | ||||
| Spontaneous vaginal delivery | 23 (38.3%) | 27 (16.8%) | 282 (45.9%) | 46 (41.8%) |
| Instrumental vaginal delivery | 8 (13.3%) | 8 (5.0%)* | 64 (10.4%) | 12 (10.9%) |
| Risk Ratio | 0.37 (0.15 to 0.95) | |||
| Caesarean section | 29 (48.3%) | 126 (78.3%) | 269 (43.7%) | 52 (47.3%) |
| Risk ratio | 1.62 (1.23 to 2.13) *** | 0.90 (0.69 to 1.19) | 0.98 (0.70 to 1.36) | |
| Gestational age at delivery, weeks | 37.3 (3.2) | 33.2 (4.1) | 38.3 (3.7) | 39.1 (1.7) |
| Mean difference (95% CI) | - 2.02 (-3.01 to -1.03) *** | 0.99 (-0.13 to 1.84) * | 1.77 (0.89 to 2.64) *** |
Data are given as mean (standard deviation) or number (percentage) together with risk ratios and 95% confidence intervals (CI).
Risk ratio: comparison with preeclampsia with proteinuria of 300–499 mg/24 hours; *P≤0.05; **P≤0.01; ***P≤0.001