alexa Reproductive characteristics and risk of uterine leiomyomata.
Reproductive Medicine

Reproductive Medicine

Gynecology & Obstetrics

Author(s): Terry KL, De Vivo I, Hankinson SE, Missmer SA

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Abstract OBJECTIVE: To evaluate whether menstrual and reproductive characteristics may influence development of uterine leiomyomata since sex steroid hormones have been hypothesized to play a role in their development. DESIGN: A prospective cohort study (Nurses' Health Study II). SETTING: Participants were identified from 14 states and followed for 14 years. PATIENT(S): A cohort of 116,609 female registered nurses ages 25-42 at baseline. INTERVENTION(S): We obtained data on uterine leiomyomata incidence and exposures through biennial questionnaires. We calculated hazard ratios and 95\% confidence intervals adjusted for known and suspected risk factors. MAIN OUTCOME MEASURE(S): Uterine leiomyomata confirmed by ultrasound or hysterectomy. RESULT(S): During 1,163,439 person-years of follow-up, 9,847 self-reported cases of hysterectomy- or ultrasound-confirmed uterine leiomyomata were reported. We observed a lower incidence of uterine leiomyomata with later age at menarche, longer menstrual cycles, parity, later age at first and last birth, shorter time since last birth, and breastfeeding. CONCLUSION(S): Hormonal and anatomical changes associated with menstruation and pregnancy may influence uterine leiomyomata incidence. Copyright © 2010 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.
This article was published in Fertil Steril and referenced in Gynecology & Obstetrics

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