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Postoperative scores from the Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire and the distribution for each preoperative McGowan grade. The median value for each McGowan grade is a marked line on the box plot. Grade 3 statistically differed from grades 1 and 2 (Kruskal–Wallis test, p=0.002; subsequent Mann–Whitney U test; values written in McGowan grade 3 are outliers).
