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By Mary B. Breckenridge
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Additional resources for Age, Time, and Fertility. Applications of Exploratory Data Analysis
Substantial change, for example in marriage patterns, can also occur within such age groups. Some irregularity is also created by the age grouping, particularly by the artificial barriers at 19/20 and 24/25. For example, in Figs. 17 note that the progression of the mean age of childbearing at a standard level of fertility is smoother for cohorts by single year of age than for cohorts by 5year age groups. The principal analyses are therefore also carried out for the SYAC13 time sequence of fertility schedules for the birth cohorts of 1870/1871-1924/1925, with fertility histories completed at age 50 in 1920/ 1921-1974/1975 (Sweden, 1976; see Chapter IV, N o t e 1, on the dual year designation for these cohorts).
Except for the brief prominent increase in childbearing at ages 3 0 - 3 9 in the 1940s, the partial and temporary recovery of the total fertility rate from the low levels of the 1930s depended on w o m e n below age 30. The first notable increases in childbearing at ages 15-19 occurred during the recovery period and supplemented the prominent increases for w o m e n aged 2 0 - 2 9 . Temporary departure from a late age pattern of marriage was one factor in the higher rates. The first indications of such a change in marriage age appeared about 1935 (see Fig.
Sweden's experience in the 1950s, similar to that of other Northern and Western European countries, involved a much less pronounced "baby b o o m , " however, than occurred in the U . S . , Canada, Australia, and N e w Zealand (Teitelbaum, 1973; Campbell, 1974). The differences between the U . S . and Sweden, measured in the total fertility rates for the 1945-1965 period, can be examined in Fig. 1. Since that period, the low fertility rates in Sweden occur in a new context: the proportions of w o m e n married at the younger ages have returned to the levels of the 1930s, but the increasing popularity of nonmarital cohabitation has contributed to an unprecendented increase in the proportion of births that occur outside of legal marriage.
Age, Time, and Fertility. Applications of Exploratory Data Analysis by Mary B. Breckenridge