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Relationship between years throwing and percent throwing-to-nonthrowing arm difference in midshaft humerus estimated strength (polar Strength Strain Index; SSIP). The percent throwing-to-nonthrowing arm difference represents the skeletal gain due to throwing (i.e. unilateral physical activity) over that due to normal growth (i.e. observed contralaterally within the non-throwing arm). *Indicates p < 0.001, as determined linear regression analysis.
