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Table 4 Correlations between age, sex, and different measures of handedness in the twin sample (lower triangle) and in the singleton sample (upper triangle)

From: Prevalence and heritability of handedness in a Hong Kong Chinese twin and singleton sample

 AgeSexWriting handDrawing handEHIEHI2PegQPegQ2
Age .05.02.04.07.08−.06.02
Sex.01 .03−.03.08.02.03.08
Writing handa.00.04 .62**.69**.73**.40**.34**
Drawing hand a−.03.05.71** .67**.66**.29**.24**
EHI−.02.05.80**.72** .81**.42**.35**
EHI2a−.07.02.85**.71**.84** .44**.39**
PegQ.08.02.44**.37**.44**.44** .70**
PegQ2 a.08−.03.46**.34**.43**.44**.67** 
  1. Measures marked with a are binary handedness variables with 0 = NRH and 1 = RH;
  2. Sex is coded as 0 = male, 1 = female; * p < .05, ** p < .01