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Table 1

Summary statistics for studies

CountryNumber of BirthsNumber of Potential TwinsPotential Twin RateNumber of ParentsYear Min.Year Max.Source
France 130,746 3,756 0.029 35,849 1600 1788 Henry 
France 49,742 1,520 0.031 16,018 1789 1895 Henry 
England 59,687 950 0.016 10,153 1730 1949 FOE 
England 31,001 814 0.026 11,287 1900 1949 FOE 
England 76,959 1,355 0.018 7,731 1539 1826 CAMPOP 
Québec 374,082 8,780 0.023 52,725 1625 1835 IMPQ 
CountryNumber of BirthsNumber of Potential TwinsPotential Twin RateNumber of ParentsYear Min.Year Max.Source
France 130,746 3,756 0.029 35,849 1600 1788 Henry 
France 49,742 1,520 0.031 16,018 1789 1895 Henry 
England 59,687 950 0.016 10,153 1730 1949 FOE 
England 31,001 814 0.026 11,287 1900 1949 FOE 
England 76,959 1,355 0.018 7,731 1539 1826 CAMPOP 
Québec 374,082 8,780 0.023 52,725 1625 1835 IMPQ 

Note: Years refer to observed births.

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