No association between age at menarche and sex of offspring | Zendy

Frank Geller | Zendy; Bjarke Feenstra | Zendy; Mads Melbye | Zendy

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No association between age at menarche and sex of offspring

Author(s) -

Frank Geller,

Bjarke Feenstra,

Mads Melbye

Publication year - 2011

Publication title -

human reproduction

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.446

H-Index - 226

eISSN - 1460-2350

pISSN - 0268-1161

DOI - 10.1093/humrep/der306

Subject(s) - menarche , offspring , association (psychology) , medicine , demography , physiology , biology , psychology , pregnancy , genetics , sociology , psychotherapist

Sir, We read with interest the article by Fukuda et al. (2011). The title ‘The sex ratio of offspring is associated with the mothers’ age at menarche’ suggests a direct connection between age at menarche and sex of offspring. We consider this interpretation a stretch of the presented data and want to comment on some issues in their study. Additionally, results from our substantially larger Danish cohort are presented. We would like to start with raising some points in the analysis by Fukuda et al. (2011) that make their results look more extreme than they actually are:

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