Table 2. Risk factors for preeclampsia in twin pregnancies from univariate analysis.
| Risk Factor | No preeclampsia (n = 516) | Preeclampsia (n = 172) | OR (95% CI) |
|---|---|---|---|
| Nulliparity | 309 (59.6%) | 118 (68.6%) | 1.46 (1.01–2.11) |
| Elderly gravidarum | 151 (29.2%) | 53 (30.8%) | 1.08 (0.73–1.59) |
| Previous preeclampsia | 1 (0.2%) | 2 (1.2%) | 6.06 (0.55–67.24) |
| Aspirin use during ANC | 16 (3.1%) | 4 (2.3%) | 0.75 (0.25–2.27) |
| IVF | 84 (16.3%) | 38 (22.2%) | 1.47 (0.95–2.25) |
| Egg donation | 1 (0.2%) | 2 (1.2%) | 6.06 (0.55–67.24) |
| Chronic hypertension | 5 (1.0%) | 12 (7.0%) | 7.66 (2.66–22.09) |
| Gestational diabetes | 31 (6.0%) | 10 (5.8%) | 0.97 (0.43–2.11) |
| Late ANC | 211 (40.9%) | 64 (37.2%) | 0.86 (0.59–1.24) |
| Obesity | 82 (15.9%) | 37 (21.5%) | 1.45 (0.92–2.29) |
| Excessive gestational weight gain | 33 (6.4%) | 21 (12.2%) | 2.04 (1.10–3.75) |
| Low gestational weight gain | 206 (39.9%) | 46 (26.7%) | 0.55 (0.37–0.82) |
| Monochorionicity | 225 (43.6%) | 87 (50.6%) | 1.32 (0.92–1.90) |
OR: odds ratio, CI: confidence interval, ANC: antenatal care, IVF: in-vitro fertilization