Perinatal factors in hand and eye preference: data from the Collaborative Perinatal Project

Data from 5,899 girls and boys were analysed for relationships between birth order and birth stress and hand and eye preference at age seven. None of the variables were significantly related at the 0.05 level; however left eye preference was related to birth stress in boys. When the two sexes were combined left eye and hand preference was also associated with low birth weight and high birth weight, and also right lateral position of the head in the maternal pelvis.