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Twinning is associated with an increased risk of left-handedness and inverted writing hand posture
1Psychology Department, University of British Columbia, Vancouver, Canada.
Early Human Development
|December 16, 1994
Abstract:
Left-handedness and inverted handwriting postures are more frequent among birth-stressed individuals. Because twinning is also associated with increased birth risk, 298 twins were compared to 1192 age and sex matched singletons. Both left-handedness and inversion were significantly more common in twins, although other indexes of laterality were not affected.