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Test efficiency plots of serum sIL-2R and CK values for identifying active myositis. (a) Values of test efficiency peaked at a cutoff point of sIL-2R at 151 pM (dashed line). (b) 90% efficiency was obtained at the optimal cutoff value of CK at 289 UI/L (dashed line) but efficiency was 75% at the upper limit of the normal value of CK at 147 UI/L (dotted line).
