Statistics Canada
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Average reaction time of secondary students

Right hand
  Ambidextrous Left-handed Right-handed
seconds
Girls 0.40 0.41 0.41
Boys 0.37 0.38 0.37
Left hand
  Ambidextrous Left-handed Right-handed
seconds
Girls 0.41 0.41 0.43
Boys 0.38 0.38 0.39