Paternal age and twinning in the Jerusalem Perinatal Study.

OBJECTIVE To investigate whether incidence of twin deliveries is related to father's age, independently of mother's age, and whether it differs for same-sex or opposite-sex twin sets. STUDY DESIGN In a program of research on effects of paternal age, this study used data from a prospective cohort of 92,408 offspring born in Jerusalem from 1964 to 1976. Of… CONTINUE READING