What question did this study set out to answer?

The aim is to evaluate trends in fetal and neonatal mortality associated with twin pregnancies over time.

Time Trends in Characteristics and Outcome of Twin Pregnancies

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Reports changes in mortality rates among twin pregnancies, highlighting healthcare impacts over time.

The aim is to evaluate trends in fetal and neonatal mortality associated with twin pregnancies over time.
Analysis of twin pairs from 22 hospitals in Quebec across two time periods (1976-1978 and 1982-1985), with sample sizes of 776 and 712 pairs, respectively.
Assessment of maternal factors, obstetrical care, and characteristics of twins regarding mortality rates.
Evaluation of delivery methods and healthcare specialization changes over the years.
Neonatal mortality for first twins decreased from 44.7 to 34.7 per 1000 liveborn, and for second twins, from 56.8 to 36.1 per 1000 liveborn.
The proportion of twin births delivered by obstetricians and in ultraspecialized perinatal units increased significantly.
Despite changes in several maternal and obstetric factors, they did not fully explain the decrease in neonatal mortality rates among twins.

Moreault et al. (1991) studied this question.

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