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PubMed1989

[[Proportional hazards model analysis of women's reproductive career in present-day Japan]].

The 1st section of this paper, using a method to decompose a change in the total marital fertility rate into the quantum and tempo effects, confirmed the major effect of birth timing on the 1970s trends in the total marital fertility rate based on the pooled data of the 8th and 9th Japanese National Fertility Surveys of 1982 and 1987, respectively. In the next section, proportional hazards model analyses of the 1st, 2nd, and 3rd birth functions for the pooled data made it clear that the 1st and 2nd birth intervals among the marriage cohorts since the end of the 1960s were shorter than those in the early 1960s even after having controlled for other variables. Given that 1 conception or more can occur during a birth interval, proportional hazards model analyses were again utilized to examine the effects of various variables on the time elapsed since marriage and the 1st conception, the time between the end of the 1st pregnancy and the 2nd conception, and the time between the end of the 2nd pregnancy and the 3rd conception. The authors found that the 1st-conception probability of the marriage cohorts since the late 1960s was smaller than that of predecessors, while the 2nd-conception probability was not affected by marriage cohort. In the last section, a logistic regression analysis of the probability of induced abortion showed that the probability of aborting a 2nd pregnancy decreased in the 1970s compared with that in the early 1960s. When a proportional hazards model analysis of the 2nd birth function was applied after omitting those cases where the 1st pregnancy did not result in birth and/or the 2nd pregnancy was aborted, the strong effect of marriage cohort on the 2nd birth probability was substantially diluted. These facts suggest that the shortened 2nd birth interval in the 1970s was partly caused by the shrinking probability of aborting a 2nd pregnancy in this period.

Abortion, Induced↗
PubMed1989

[[Child-sex effects on further births]].

This paper clarifies the child-sex effects on the number of additional children in Japan. The data were retrospective birth histories of the 8th Japanese National Fertility Survey carried out by the Institute of Population Problems in 1982. 1st, the authors found that the majority of the Japanese had a balanced sex preference. There was a slight shift from boy preference to girl preference in terms of the parity progression ratio. The effect of the 1st child's sex was small, but the effect of the parity-2 sex combination was as big or bigger than that of other socioeconomic variables. Next, the authors observed some evidence suggesting strong sex preference in opinion and behavior, such as differential intentions of further childbearing due to the sex of previous children and differences in the number of abortions caused by the sex combination of living children. Finally, the authors noted further issues to be examined in the study of sex preference in Japan.

Abortion, Induced↗
PubMed1989

Fertility transition in Indonesia, trends in proximate determinants of fertility, based on the 1987 NICPS/DHS.

The authors "estimate proximate determinants of fertility in Indonesia from the 1987 National Indonesia Contraceptive Prevalence Survey (1987 NICPS). For Java and Bali, the results will be compared to the 1976 Indonesia Fertility Survey's estimates of proximate determinants [to]....provide a better understanding of the causes of fertility decline in Java-Bali during 1976-1987." A theoretical model is used to estimate biological and behavioral proximate determinants of fertility, including marriage and divorce, infertility, postpartum amenorrhea, contraceptive use, induced abortion, fecundability and coital frequency, and fetal death. (SUMMARY IN IND)

Abortion, Induced↗