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The correlation of ACL scores to the utility values. All scores correlated significantly with the utility values (p < 0.05), however, the correlation was strongest for the IKDC subjective knee score (r = 0.86, 95% CI: 0.81, 0.90). Either linear regression (A and B) or third order polynomial non-linear regression (C) was used to find a curve representing most reasonably the trend of the correlations.
