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Table 2

Twin parameters

SampleSurvival Rate, NontwinsSurvival Rate, TwinsAverage Births per MarriageSame-Sex Ratio, TwinsSame-Sex Ratio, Expected
France, pre-1789 0.71 0.47 5.31 0.64 0.62 
France, post-1789 0.70 0.41 4.66 0.68 0.61 
England, CAMPOP 0.70 0.46 4.66 0.59 0.70 
England, 1780–1879 0.65 0.55 5.96 0.64 0.72 
England, 1900–1949 0.91 0.72 3.37 0.55 0.63 
Québec 0.71 0.52 5.64 0.68 0.65 
SampleSurvival Rate, NontwinsSurvival Rate, TwinsAverage Births per MarriageSame-Sex Ratio, TwinsSame-Sex Ratio, Expected
France, pre-1789 0.71 0.47 5.31 0.64 0.62 
France, post-1789 0.70 0.41 4.66 0.68 0.61 
England, CAMPOP 0.70 0.46 4.66 0.59 0.70 
England, 1780–1879 0.65 0.55 5.96 0.64 0.72 
England, 1900–1949 0.91 0.72 3.37 0.55 0.63 
Québec 0.71 0.52 5.64 0.68 0.65 
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