Influence of paternal age on assisted reproductive technolog
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The study suggests that paternal age of 45 years or more is associated with a lower likelihood of pregnancy and live birth among couples undergoing IVF. The negative effect of paternal age is most notable among women aged ?35 years.

The objective of this study by the Fertility and Sterility was to characterize paternal age among assisted reproductive technology (ART) cycles performed in the United States and to evaluate the influence of paternal age on ART cycles and perinatal outcomes.

All reported fresh, nondonor, noncancelled in vitro fertilization (IVF) cycles performed in 2017 were included. The primary outcomes were intrauterine pregnancy, live birth (?20 weeks), and miscarriage (<20 weeks) per cycle start and per embryo transfer. The secondary outcomes were full-term live birth (?37 weeks) among singleton and twin gestations.

Among 77,209 fresh nondonors, noncancelled IVF cycles, the average paternal age was 37.8 ± 6.3 years and the average maternal age was 35.5 ± 4.6 years.

--Compared with paternal age ?45 years, paternal age ?46 years was associated with a lower likelihood of pregnancy per cycle and per transfer, as well as a lower likelihood of live birth per cycle and per transfer after controlling for maternal age and other confounders.

--When restricted to women aged <35 years, there were no significant differences in the rates of live birth or miscarriage among couples in which the men were aged ?45 years compared with those aged ?46 years.

Conclusively, compared with paternal age ?45 years, paternal age ?46 years is associated with a lower likelihood of pregnancy and live birth among couples undergoing IVF. The negative effect of paternal age is most notable among women aged ?35 years, likely because maternal age is a stronger predictor of ART outcome.

Source: https://doi.org/10.1016/j.fertnstert.2021.03.033
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