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A few years ago, the late M.P. Bryden, a professor of psychology at the University of Waterloo, worked out with several colleagues a standardized questionnaire on handedness for use in any culture and then showed that it appears more often in some places than others.
Their research shows that in Canada and the U.K., the proportion of left-handers is about 11.5%. As one moves eastward the number falls: 7.5% in the United Arab Emirates, 5.8% in India, 4% in Japan. In Africa, 7.9% of those in the Ivory Coast and 5.1% of those in the Sudan were left-handed.