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. 1994 Dec 16;40(1):23-7.
doi: 10.1016/0378-3782(94)90096-5.

Twinning is associated with an increased risk of left-handedness and inverted writing hand posture

S Coren  1
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Twinning is associated with an increased risk of left-handedness and inverted writing hand posture

S Coren. Early Hum Dev. .

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.

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