双生児法による乳児・幼児の発育縦断研究(1)(首都圏ふたごプロジェクト) : その構想とパイロット調査の評価

概要

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論文The present paper introduces the outline of "A Longitudinal Study of Twins in Early Childhood" by ToTCoP (Tokyo Twin Cohort Project), and reports its procedure to recruit parents rearing infant twins and basic outcomes of an on-going pilot study. Invitation letters were mailed to 309 families with twins of 9-14 month of age who live in Tokyo area, out of which 179 families responded and sent back an entry-sheet by July22, 2005. Response rate was 57.9%. No sample biases were found in terms of geographical regions, parents', ages, sex combination of twins, family types and so on. Reinvitation letters raised the response rate, and the number and the kind of mailing stamps attached on the envelop facilitated quick response.
慶應義塾大学大学院社会学研究科の論文