Ounsted M, Cockburn J, Moar V A
J Dev Behav Pediatr. 1985 Apr;6(2):76-80.
The development of 199 children was studied at regular intervals from birth to 7.5 years. On each occasion hand preference was recorded. Their preferred hand was evident in 89.4% right and 85.7% left-handers by 4 years. Analyses on 242 children seen at birth and 7.5 years showed no associations between left-handedness and nine factors representing different aspects of "birth stress." For 12 of 15 aspects of ability at 7.5 years left-handed children had slightly higher scores than right-handers. Pathological factors do not seem to feature in the provenance or consequences of left-handedness in a normal healthy population.
对199名儿童从出生到7.5岁进行定期发育研究。每次都记录其用手偏好。到4岁时，89.4%的右利手儿童和85.7%的左利手儿童其优势手已很明显。对242名在出生时和7.5岁时接受观察的儿童进行分析，结果显示左利手与代表“出生应激”不同方面的九个因素之间没有关联。在7.5岁时，左利手儿童在15项能力中的12项上得分略高于右利手儿童。在正常健康人群中，病理因素似乎与左利手的成因或后果无关。
