Table 3.
Obstetric outcome between rubella seronegative (n = 6363) versus seropositive (n = 62,669) nulliparous gravidae.
| Rubella status | p | RR (95% CI) | ||
|---|---|---|---|---|
| Seronegative | Seropositive | |||
| Medical history (%) | 10.9 | 12.9 | < 0.001 | 0.847 (0.787–0.911) |
| Abortion history (%) | 40.4 | 37.5 | < 0.001 | 1.076 (1.043–1.111) |
| Obstetric complications (%) | 20.7 | 18.8 | 0.015 | 1.096 (1.018–1.180) |
| Gestational hypertension | 1.3 | 1.7 | 0.023 | 0.772 (0.617–0.966) |
| Pre-eclampsia | 2.0 | 1.8 | 0.268 | 1.109 (0.924–1.332) |
| Gestational diabetes | 6.2 | 6.7 | 0.198 | 0.937 (0.848–1.035) |
| Placental abruption | 1.2 | 1.1 | 0.390 | 1.107 (0.878–1.395) |
| Placenta praevia | 0.8 | 0.8 | 0.645 | 0.934 (0.700–1.247) |
| Preterm birth < 37 weeks | 6.5 | 6.6 | 0.699 | 0.981 (0.889–1.082) |
| Post-dated pregnancy | 1.7 | 0.9 | < 0.001 | 1.900 (1.550–2.329) |
| Labour induction | 27.3 | 28.6 | 0.037 | 0.957 (0.917–0.998) |
| Instrumental vaginal delivery | 20.6 | 20.6 | 0.971 | 1.001 (0.939–1.068) |
| Caesarean section | 23.6 | 22.9 | 0.216 | 1.030 (0.983–1.079) |
| Manual removal of placenta | 4.9 | 3.8 | < 0.001 | 1.270 (1.132–1.426) |
| Postpartum haemorrhage | 3.2 | 3.6 | 0.080 | 0.881 (0.764–1.015) |
| Infant ≥ 4000 g | 2.7 | 2.0 | < 0.001 | 1.344 (1.147–1.574) |
| Infant < 2500 g | 7.2 | 7.7 | 0.150 | 0.934 (0.852–1.025) |
| Male infant | 51.1 | 51.7 | 0.346 | 0.988 (0.963–1.013) |
| Apgar score < 7 at 5th min | 0.5 | 0.6 | 0.532 | 0.893 (0.626–1.274) |
| Perinatal mortality | 0.4 | 0.4 | 0.491 | 0.861 (0.563–1.318) |
| Stillbirth | 0.2 | 0.3 | 0.261 | 0.733 (0.426–1.262) |
| Neonatal death | 0.1 | 0.1 | 0.635 | 1.182 (0.592–2.359) |
Significant differences shown in bold.
Results in %, analysis with chi square test and relative risk (RR) and 95% confidence intervals (CI).