Background: Twin deliveries have a high risk of adverse birth outcomes, but most data comes from high-resource settings. The prevalence and outcomes of twin pregnancies in Botswana have not previously been reported.
Methods: The Tsepamo Study conducted birth outcomes surveillance at 8 hospitals (~40% of all births in Botswana) from August 2014-June 2018 and up to 18 hospitals (~70% of all births in Botswana) from July 2018-March 2019. Maternal demographics, antenatal care visits, ultrasound reports, and infant delivery characteristics (including the number of infants delivered, gestational age (GA) at delivery, birthweight, and vital status at birth and discharge) were abstracted from maternity obstetric records. Log binomial regression models were fit to determine the relative risk (RR), adjusted risk (aRR), and 95% confidence intervals (95% CI) of adverse birth outcomes among twin compared with singleton pregnancies. Higher order multiples were excluded from analyses.
Results: Between August 2014 and March 2019, 119,477 deliveries were recorded, including 1859 (1.6%) sets of twins. Women with twin pregnancies had a similar median number of antenatal care visits (9 vs. 10), but were more likely to deliver in a tertiary center (54.8% vs. 45.1%, p<0.001) and more likely to have a C-section (54.6% vs. 22.0%, p<0.001) than women with singletons. Adverse birth outcomes were notably higher in twins than in singletons. Compared with singletons, twin pregnancies had a higher risk of preterm delivery (<37 weeks GA) (47.6% vs. 16.7%, aRR 2.8, 95% CI 2.7, 2.9) and very preterm delivery (<32 weeks) (11.8% vs. 4.0%, aRR 3.0 95% CI 2.6, 3.4). Twin pregnancies were more likely than singletons to have at least one low-birthweight (77.1% vs. 13.6%, aRR 4.5, 95% CI 4.3, 4.6) or very low-birthweight (16.8% vs. 3.2%, aRR 5.2, 95% CI 4.7, 5.8) infant. Among all twin pregnancies, 128 (6.9%) had at least one stillborn infant compared with 2845 (2.4%) stillbirths among singletons (aRR 2.8, 95% CI 2.3, 3.3).
Conclusion:
Adverse birth outcomes are common among twins in Botswana, and are often severe. Interventions that allow for earlier identification of twin gestation and improved antenatal management of twin pregnancies may improve infant and child survival.