To the Editor.—
In normal populations, there is the suggestion that left-handedness may be associated with delayed physical maturation.1 For example, in a sample of 713 females, the onset of puberty was denoted by the age of menarche and relative body size, while for a sample of 467 males, the index of sexual maturity was the onset of secondary sexual characteristics (body hair) as well as relative body size. This study found that left-handedness is associated with delayed sexual maturation in both genders.The difference in the onset of the pubertal growth spurt might suggest, among other things, that left-handers may have slighter body builds as a function of the delayed maturation pattern. To test this hypothesis, I took, as a convenience sample, data from The Baseball Encyclopedia2 on all 3707 pitchers who ever played major league baseball up to 1975 to determine the relative body size of
Coren S. Southpaws—Somewhat Scrawnier. JAMA. 1989;262(19):2682–2683. doi:10.1001/jama.1989.03430190062022
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