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CARS Archives

Paternal Age
Title: Increasing paternal age is associated with delayed conception in a large population of fertile couples: Evidence of declining fecundity in older men
Author: W. C. Ford, et al.
Address: Bristol, UK
Source: Human Reproduction 15:1703-1708 (August) 2000
Summary: Because controversy continues to surround the issue of aging and male fertility, researchers conducted this study to determine the effect of male age on the length of time it takes to conceive. This study is based on pregnancies that resulted in the birth of a baby. Both the male and female partners completed questionnaires at 18 weeks gestation. The questions were related to such topics as parity, paternity, cohabitation, oral contraception, education, smoking and obesity. Out of 8515 planned pregnancies, 74% were conceived in £6 months, 14% in the second 6 months and 12% after more than a year. After adjustment for 9 different variables, including the age of the woman, the likelihood of conception within 6 or 12 months was lower in older men. Compared to men less than 25 years old, the adjusted odds ratios for conception £12 months were 0.62 in men aged 30-34, 0.50 in men 35-39, and 0.51 in men >40 years of age.
Comment: Still not too bad for the old men.

 

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