To the Editor.—
Leviton and Kilty have suggested that in a survey of schoolgirls there was a significant excess of left-handers born around the month of November (Archives 36:115-116, 1979). Regrettably, it is not easy to assess their claim, since they give no data, merely the result of a statistical significance test. Nevertheless, since there were only 33 left-handed schoolgirls in their sample, each month-category can only have contained an average of 2.75 persons. I would like to report results from a larger study of my own, which failed to find any evidence of a significant seasonal trend, either in men or in women.Data were collected by means of two large questionnaires distributed to undergraduates at the University of Cambridge (I. C. McManus, MA, MB, ChB, unpublished data, 1979). In survey 1, a total of 948 students gave detailed information about their handedness. In survey 2, not only did
McManus IC. Season of Birth of Left-Handers. Arch Neurol. 1980;37(1):63. doi:10.1001/archneur.1980.00500500093020
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