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Latitude Gradients and Secular Trends in Sex Ratios at Birth: Europe and North America and a Global Overview

DOI: 
10.7727/wimj.2017.093
Pages: 
Synopsis: 
The sex ratio at birth is in overall decline in Europe and North America. However, this decline has reversed in Mexico and stabilised in the United States. There was a temporary significant rise in M/F in Central Europe following Chernobyl.

ABSTRACT

Objective: In all continents, latitude gradients and secular trends have been found in the male-female ratio at birth (M/F: male births divided by total births), which is anticipated to approximate 0.515.

Methods: Annual national data for countries comprising Europe and North America for male and female live births were obtained from the World Health Organisation and analysed with contingency tables.

Accepted: 
01 May, 2017
PDF Attachment: 
Journal Sections: 
Journal Authors: 
e-Published: 18 May, 2017

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