Fertility in twins.
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.
Steeno
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Department of Internal Medicine, University Hospitals, Leuven, Belgium.
Vlietinck
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D001724:Birth Weight; D005260:Female; D005298:Fertility; D006801:Humans; D007223:Infant; D008297:Male; D011795:Surveys and Questionnaires; D014427:Twins