title: Are there too many "times-to-pregnancy"?
abstract: The time between marriage and the birth of the first child has been used by demographers as a measure of fecundity, but such a measure only works if cohabitation and wanting to have a child are closely linked to marriage. In a world where pregnancies can be planned for those who have access to safe contraception methods, couples may know their "time-to-pregnancy" (TTP) as the waiting time from when they stopped using contraceptive methods until becoming pregnant or being classified as infertile (a period of ≥ 12 months). This TTP measure was first used in 1981 (1) as a measure of couple fecundity and it has been applied widely with success and failure in many areas of research including work-related fecundity problems (2, 3, 4). In this letter, some less well-known limitations of the TTP measure are discussed.
authors.affiliation: Department of Clinical Epidemiology, Aarhus University, Olof Palmes Allé 43-45, Aarhus, Denmark. jo@ph.au.dk.
authors.forename: Jørn
authors.initials: J
authors.lastname: Olsen
mesh_terms: D005260:Female; D005306:Fertilization; D006801:Humans; D008297:Male; D011247:Pregnancy; D061685:Time-to-Pregnancy