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
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.
Edited by Aldo Campana,