TABLE 3.
Summary table of maternal outcomes for effect and heterogeneity: twins compared with singleton pregnancies after in vitro fertilization/intracytoplasmic sperm injection treatment.
| Outcome | Heterogeneity I2 % (P value) | OR (95% CI) |
|---|---|---|
| Antenatal hospitalization | 52 (.05) | 2.6 (1.9–3.5) |
| Cesarean delivery | 93 (<.01) | 3.7 (3.3–4.1) |
| Gestational diabetes mellitus | 58 (<.01) | 1.2 (1.1–1.3) |
| Placental abruption | 0 (.82) | 1.3 (1.2–1.5) |
| Placenta previa | 66 (.02) | 0.8 (0.7–0.9) |
| Pregnancy-induced hypertension | 78 (<.01) | 2.0 (1.9–2.3) |
| Postpartum hemorrhage | 91 (<.01) | 2.2 (1.2–4.1) |
| Preterm labor | 91 (<.01) | 6.3 (3.6–11.0) |
| Preeclampsia | 40 (.12) | 1.9 (1.4–2.6) |
Note: CI = confidence interval; OR = odds ratio.