2018
DOI: 10.3861/kenko.84.4_117
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Conception delay and spontaneous and indicated preterm birth among primiparous women in Japan

Abstract: To examine whether a longer time to pregnancy is associated with preterm births distinguished as either spontaneous or indicated delivery. Methods: A cross-sectional survey was conducted targeting parous women aged 20-44 years old residing across Japan whose first-born children were singletons. Information on reproductive history including time to pregnancy (TTP) and use of assisted reproductive technology (ART) was collected using internet-based questionnaire. A delivery was judged spontaneous if the mother h… Show more

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