Secondary Sex Ratio in Multiple Births

Attempts have been made to identify factors influencing the sex ratio at birth (number of males per 100 females). Statistical analyses have shown that comparisons between sex ratios demand large data sets. The secondary sex ratio has been believed to vary inversely with the frequency of prenatal los...

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Veröffentlicht in:	Twin research and human genetics 2010-02, Vol.13 (1), p.101-108
Hauptverfasser:	Fellman, Johan, Eriksson, Aldur W.
Format:	Artikel
Sprache:	eng
Schlagworte:	Birth Chi-Square Distribution Female Humans Infant, Newborn Infants live births Male Marital status Models, Statistical Mortality Multiple birth Multiple Birth Offspring Multiple births Multiple pregnancy Sex Ratio Statistical analysis Statistics stillbirth rate stillbirths Sweden Twins urban and rural regions χ2 tests
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