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Comparative Study
. 2005 Jul;84(1):246-8.
doi: 10.1016/j.fertnstert.2004.12.054.

Interplay between maternal weight and seasons in determining the secondary sex ratio of human offspring

Angelo Cagnacci  1 , Antonietta Renzi, Serenella Arangino, Chiara Alessandrini, Annibale Volpe
Affiliations
Free article
Comparative Study

Interplay between maternal weight and seasons in determining the secondary sex ratio of human offspring

Angelo Cagnacci et al. Fertil Steril. 2005 Jul.
Free article

Abstract

When gender of 9,284 single fetuses, which were delivered at term in the Policlinic of Modena between 1997-2001, was stratified for month of conception and for quartiles of pregravid maternal weight, it showed that the ratio of male to female fetuses (secondary sex ratio) was characterized by a clear seasonal variation that was modulated by pregravid maternal weight. Two seasonal peaks of sex ratio (March and October +/- 31 days) were observed in mothers in the lowest two quartiles of prepregnancy body weight (< or =62 kg), and one single peak (October +/-36 days) was observed in mothers with preconception weight in the upper two quartiles.

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Comment in

  • Seasonal rhythms and secondary sex ratios.
    Jongbloet PH. Jongbloet PH. Fertil Steril. 2006 Feb;85(2):536-7; author reply 537. doi: 10.1016/j.fertnstert.2005.11.014. Fertil Steril. 2006. PMID: 16595259 No abstract available.

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