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PubMed · 2609911

Fertility in twins.

O Steeno·R Vlietinck
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Abstract

From the 474 twins born in 1950 in 100 Flemish cities and towns in Belgium, 85% reached the age of 20 yr, against 37% in Austria a hundred years ago. More female than male twins are married (P = 0.03), in particular nonidentical female twins (P = 0.02). Fertility seems to be lower in male, especially male-male twins (P less than 0.03), and most strikingly so in identical male twins (P = 0.05). There seems to be no influence of premature birth or low birthweight.

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O Steeno, R Vlietinck. 1989. Fertility in twins.. https://doi.org/10.1017/s0001566000002853

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