Balakrishnan, T. R., Rao, K.Vaninadha, Krotki, Karol J. et Lapierre-Adamcyk, Evelyne. 1988. «Age at First Birth and Lifetime Fertility ». Journal of Biosocial Science, vol. 20, p. 167-174.
Intentions : « The present analysis investigates number of children born to women by various exact ages, classified by their age at first birth. This is done separatly for the different birth cohorts wich permits examination of the effect of the starting age on cumulative fertility not only at the end of a woman’s reproductive life but also at intermediate points. » (p. 169)
Échantillon/Matériau : « The data for this study come from the Canadian Fertility Survey of 1984 (CFS) in wich a national probability sample of 5315 women of all marital statuses in their reproductive years of 18-49, was interviewed by telephone. [...] The analysis in this paper is based only on women born in the period 1935-1959 (aged 25-49 in 1984) who had married or had a first birth prior to age 25. This selection reduced the sample to 3564 women, about two-thirds of the total. [...] Women were classified into five cohorts, born in 1935-39, 1940-44, 1945-49, 1950-54 and 1955-59. » (p. 168)
Type de traitement des données : Analyse statistique
« Among a national sample of Canadian women in the Canadian National Fertility Survey of 1984, the excess cumulative fertility of those who started their families early over others has steadily decreased. A difference of approximately two births between early and late starters among older women is reduced to approximately half a child among the younger women. Except for those who start childbearing after age 25, there is little evidence of attempts to catch up after age 30, irrespective of starting age. » (p. 167)