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We have previously observed that an increasing time to pregnancy (TTP) is associated with a reduced frequency of twin deliveries in couples not receiving infertility treatment. By using updated information, we assessed the frequencies of dizygotic (DZ) and monozygotic (MZ) twin deliveries as a function of infertility (TTP &gt; 12 months), as well as infertility treatment.

Infertility, infertility treatment and twinning: the Danish National Birth Cohort