Data of Twin Births occurring in 2 English metropolitan Hospitals

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Abstract
SUMMARY: A sample of 583 twins, delivered in two English hospitals, and divided into groups of like sex and unlike sex, has been analysed as regards distributions, means and standard deviations of mother's age, order of birth, birth weight and length of gestation time.In birth weight the unlike sex have greater means than the like sex, from which it may be deduced that dizygotic twins are heavier at birth than monozygotic.The correlation of birth weight in twins is 0.727 for like and 0.676 for unlike sex.Length of gestation time has a correlation with birth weight of 0.345 for like and 0.403 for unlike sex.Neonatal mortality (including stillbirths) is high for twins, being 16.6% as compared with 4.5 % in single births. When these rates are sub-divided into groups of birthweight, it is found that the rates for the very low weight groups are a little better for twins than for single births, but those round the mean and above it are about 3 times those for single births of average or above average weight.The mortality rates are a little lower for twins of unlike sex.
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