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8years. The KOOS-Child showed high internal consistency (Cronbach's a 0.80-0.96). Adequate convergent validity with  75% relevant a priori hypotheses was confirmed. Construct validity was moderate to strong (Pearson's r correlations between related KOOS and Kid-KINDL subdimensions 0.54-0.62). KOOS and KIDSCREEN subdimensions correlations were fair (Pearson's r correlations 0.32-0.65). KOOS-Child's diagnostic accuracy was high. Factor analysis extracted height factors accounting for 76.15% of the total variance, confirmed by the scree