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Mean birthweight with 95% CI by handedness and birth order in triplets. Right-handers (n = 919) had significantly higher birthweight than left-handers (n = 124; 11.9%) in Japan (A). Right-handers (n = 707) had significantly higher birthweight than left-handers (n = 126; 15.1%) in the Netherlands (B). Percentages indicate the prevalence of left-handers within birth order groups, for P values, see Table 2.
