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[Age, parity, and time in fertility]
Jinko Mondai Kenkyu. [Journal of Population Problems]
|April 1, 1986
Summary
Japanese fertility rates declined significantly between 1935 and 1969. Analysis of vital statistics data reveals changes in birth intervals and age at first birth across female birth cohorts.
Area of Science:
- Demography
- Population Studies
- Sociology
Background:
- Fertility trends are crucial for understanding population dynamics and societal changes.
- Japan experienced significant demographic shifts in the mid-20th century.
Purpose of the Study:
- To analyze detailed fertility trends in Japan from 1935 to 1969.
- To examine changes in birth patterns across different female birth cohorts.
Main Methods:
- Utilized vital statistics data from 1935-1969.
- Constructed age-parity adjusted net reproduction tables for 35 female birth cohorts.
- Calculated cohort net reproduction rate, total fertility rate, mean age at first/second birth, and average birth intervals.
Main Results:
- Demonstrated a decline in fertility rates across cohorts during the study period.
- Observed changes in the timing of births (e.g., mean age at first birth) and birth intervals.
- Quantified fertility behavior at both cohort and parity-specific levels.
Conclusions:
- The study provides a comprehensive quantitative analysis of Japanese fertility decline.
- Findings highlight significant shifts in reproductive behavior and timing over three decades.
- The methodology offers a robust framework for analyzing historical fertility patterns.