Abstract
The influence of maternal age and congenital malformations on perinatal mortality in twins in Australia from 1973 to 1980, is described. Stillbirths and neonatal deaths in twins fell with advancing maternal age. For teenage mothers, the twin perinatal mortality rate was 127.15/1,000. The sex ratio in twins is closer to unity than in singletons. Perinatal mortality due to malformation fell as maternal age increased up to 35 years. The role of zygosity and the distribution of birth weight with maternal age are discussed.
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