Sex Ratio in Sibships With Twins

In national birth registers of Caucasians, the secondary sex ratio, that is, the number of boys per 100 girls at birth, is almost constant at 106. Variations other than random variation have been noted, and attention is being paid to identifying presumptive influential factors. Studies of the influe...

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Veröffentlicht in:	Twin research and human genetics 2008-04, Vol.11 (2), p.204-214
Hauptverfasser:	Fellman, Johan, Eriksson, Aldur W.
Format:	Artikel
Sprache:	eng
Schlagworte:	Binomial distribution Birth Chi-Square Distribution Female Human genetics Humans Male Registries Sex Ratio Siblings Statistical analysis Twins Variation
Online-Zugang:	Volltext
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