On the Mechanism of Selection of Fecundability

The composition of a cohort of exposed married women changes rapidly by the virtue of the tendency of pregnancy to select the most fecund and leave behind an increasingly subfecund residual group. This phenomenon, known as selection of fecundability, was first studied by Tietze (1959) through a crude model and later on by several authors like Potter and Parker (1964), Sheps (1964) and Potter et al (1970).