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Infertility and spontaneous abortion

The observed proportion of planned pregnancies leading to birth conceived in ≤ 6 or in ≥ 12 months according to the father's and the mother's age

  Percentage of couples conceiving within specified time interval (months)
  No. of couples 6 12
Father's age (years)
≤ 24 643 77.1 91.9
25-29 2692 78.4 91.3
30-34 2809 73.8 87.5
35-39 1153 68.6 83.3
≥ 40 573 66.3 81.3
Total n 7870    
Mother's age (years)
≤ 24 1625 76.4 90.2
25-29 3663 75.9 90.0
30-34 2466 73.8 86.5
35-39 680 62.8 80.6
≥ 40 81 59.3 75.3
Total n 8515    

Ford WC, North K, Taylor H, Farrow A, Hull MG, Golding J. Increasing paternal age is associated with delayed conception in a large population of fertile couples: evidence for declining fecundity in older men. The ALSPAC Study Team (Avon Longitudinal Study of Pregnancy and Childhood). Hum Reprod. 2000 Aug;15(8):1703-8.