The Association Between Menarche Age and First Offspring Sex Ratio

Abstract

Background: Offspring sex ratio (OSR) serves as an important social factor, and various other factors are hypothesized to be associated with it, such as maternal diet, time of ovulation and insemination, environmental phenomena, parental age, and infertility treatment. Objectives: This research was performed to assess the association between mothers' menarche age, first pregnancy age, and sex ratio of first offspring. Patients and Methods: In this retrospective study, 2,000 Iranian women of reproductive age were recruited to assess their menarche age, first pregnancy age, and first OSR.

The Survey of Magnesium Sulfate in Prevention of Intraventricular Hemorrhage in Premature Infants: A Randomized Clinical Trial

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The Effect of Luteal-Phase Support with Triptrolin Administration on Implantation and Clinical Pregnancy Rate in Assisted Reproductive Technology

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