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The 2017 European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) classification criteria for idiopathic inflammatory myopathies (IIM) are the first validated classification criteria for IIM. The criteria provide a score with a corresponding probability of having IIM. The cut-offs for classifying a patient with IIM were set at ≥5.5 and ≥6.7 in the probability models without and with available muscle biopsy results, respectively. At these cut-offs, the criteria had an 87% and 93% sensitivity, and 82% and 88% specificity, in the model without and with the muscle biopsy results. The criteria were tested for sensitivity, but not for specificity in two independent cohorts.1
We evaluated the performance …
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