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[Decomposition of the increasing rate on contraceptive users during 1971-1979 (author's transl)].


 Based on Kitagawa's concept of decomposition of the difference between 2 rates, the general contraceptive practice rate is analyzed in this study. Contraceptive practice was found to have increased by 15%, to 32.3%, in 1979. This could be due to several factors whose effect comes from changes in age composition among women, proportion currently married, and age specific contraceptive practice rate. The pure effect of age specific contraceptive practice was 138.8% of the increase; change of age composition was minus 14.5%, and proportion currently married minus 1.7%. The common effect of the 2 components was minus 0.26% by change in age composition and proportion currently married, minus 18.59% by common affects of age composition and age specific contraceptive practice, and minus 3.35% by the common effects of the proportion married and age specific practice. The interactional effect of the 3 components was minus 0.38%, which was insignificant. Additionally, age specific contribution to the increase was seen to be only 4.3% in the age group 15-24, 18.19% for those 25-29, 28.56% for those 30-34, 26.29% for those 35-39, and 26.29% for those 40-44. The most powerful demographic component affecting increase in practice was therefore found to be the age specific contraceptive practice rate, with age composition 2nd in importance and proportion currently married last. (Author's modified)
