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Performance of the 2017 European League Against Rheumatism/American College of Rheumatology classification criteria for adult and juvenile idiopathic inflammatory myopathies in clinical practice
  1. Alojzija Hočevar,
  2. Ziga Rotar,
  3. Monika Krosel,
  4. Saša Čučnik,
  5. Matija Tomšič
  1. Department of Rheumatology, University Medical Centre Ljubljana, Ljubljana, Slovenia
  1. Correspondence to Dr Alojzija Hočevar, Department of Rheumatology, Universitiy Medical Centre Ljubljana, Ljubljana 1000, Slovenia; alojzija.hocevar{at}gmail.com

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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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