Descriptive data of the study population.
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NA = not available, i.e. questions not included in the questionnaire, Q1 = 1st quartile, Q3 = 3rd quartile.1Not available for pregnancies before 1982.ASame sex female twin pairs born 1926–1966.BSame sex female and male twin pairs born 1944–1971.CEach twin was living together with a partner in a long-term relationship. The adolescent child was 11–22 years old and was living together with the parents. The cousins were the same sex and not more than 4 years apart in age.
创建时间：
2015-12-02
