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The prevalence of contraception and pregnancy outcome in the same women, at 19, 24, and 29 years of age, was assessed in a longitudinal cohort study using a postal questionnaire technique. A one-in-four random sample of all women born in 1962 and resident in the city of Goteborg in 1981, was obtained from the population register (n = 656). Respondents from 1981 were re-assessed in 1986 and 1991...