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Patterns of aggregate and individual changes in contraceptive practice. United States, 1965-1975.

This report estimates aggregate changes in contraceptive practices of continuously married white couples (both spouses married once) since 1973 including comparable data from 1970 and 1965. The 1975 study which included reinterviews with a subsample of the same women interviewed in 1970 enabled the analysis of individual changes in methods and factors affecting such changes. At the aggregate level a continued increase in the proportion of married couples currently using contraceptives and a continued decrease in the proportion that have never used contraceptives were observed. The most popular form of birth control among women married less than 10 years is still the pill though among the categories of the most longer marriage duration the pill appeared to be declining. Surgical sterilization is now the most commonly used method for married couples of 10 years or more duration. 75% of contracepting couples (from all social strata) are using the most effective methods available: sterilization pill and IUD. At the individual level about 50% of women reinterviewed in 1975 had changed to sterilization from the method they were using in 1970. Other methods which appealed to the women are the pill condom and IUD. Factors which affected decision to change method included delaying pregnancies preventing future pregnancies and experiencing unwanted pregnancies.