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Table 4

Twin effect, births

SampleExpected α, No ControlExpected α, ControlαSEN
Pre-Fertility Decline 
  France, pre-1789 0.73a 1.02 0.07 65,722 
  England, CAMPOP 1a 0.75 0.83 0.09 76,239 
  England, pre-1880 0.43a 0.99 0.12 55,590 
  Québec 0.61a 1.03 0.05 324,202 
Post-Fertility Decline 
  France, post-1800 0.87 0.89 0.12 18,454 
  England, 1900–1949 1a 0.60 0.72 0.10 27,399 
SampleExpected α, No ControlExpected α, ControlαSEN
Pre-Fertility Decline 
  France, pre-1789 0.73a 1.02 0.07 65,722 
  England, CAMPOP 1a 0.75 0.83 0.09 76,239 
  England, pre-1880 0.43a 0.99 0.12 55,590 
  Québec 0.61a 1.03 0.05 324,202 
Post-Fertility Decline 
  France, post-1800 0.87 0.89 0.12 18,454 
  England, 1900–1949 1a 0.60 0.72 0.10 27,399 

aHypothesized coefficient is rejected at p = .05.

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