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February 1979

Seasonal Variation in the Birth of Left-handed Schoolgirls

Author Affiliations

From the Department of Neurology, Children's Hospital Medical Center and Harvard Medical School, Boston (Dr Leviton), and the Department of Teacher Education, Western Michigan University, Kalamazoo (Dr Kilty).

Arch Neurol. 1979;36(2):115-116. doi:10.1001/archneur.1979.00500380085016

• The birth of left-handed girls in a school population displayed a seasonal trend, with a peak in November. No seasonal trend was seen in the birth of left-handed boys. The seasonal pattern of birth of left-handed girls is compatible with the hypothesis that nongenetic factors contribute to the occurrence of left-handedness.