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A British Columbia researcher found that the older a woman is when she becomes pregnant, the more likely she is to have a left-handed baby. Women of 40 are twice as likely as women of 20, the researcher reports in the New England Journal of Medicine.

Another study found that children born to asthmatic mothers have more than twice the rate of left-handedness as children in the general population. The study of 140 asthmatic mothers showed that nearly 20 percent of their 359 children were left-handed, said Dr. Robert Weinstein of Providence Hospital, Southfield, Mich. Left-handedness occurs in 8 percent of the general population.

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