Differential Fertility by the Result of the Previous Pregnancy

1 have suggested that at a given birth order the probability of having a further pregnancy is greater when the last pregnancy had been spontaneously aborted than when it resulted in a birth.2 Leridon,3 in the course of a valuable paper on foetal wastage, presents data which, according to him, impugn my suggestion. I would like to question his claim. His data relate to women who were selected from attenders at an ante-natal clinic. Their obstetric histories were taken, but the current pregnancy was omitted. Let us denote a live birth by L, a spontaneous abortion by S and a pregnancy with either outcome by X. Let the numbers of the various sorts of obstetric history be as follows

Biology · Differential (mechanical device) · Fertility · Gynecology · Obstetrics · Physics · Population · Pregnancy · Sociology · Demography · Historical Studies on Reproduction, Gender, Health, and Societal Changes · Medicine