The sensitivity and specificity of the new EULAR/ACR classification criteria for idiopathic inflammatory myopathies
| Sensitivity % (95% CI) | Specificity % (95% CI) | Positive predictive value % (95% CI) | Negative predictive value % (95% CI) | |
| Using the probability model without muscle biopsy results ncases=95; ncontrols=72 | 74.7 (64.8 to 83.1) | 80.6 (69.5 to 88.9) | 83.5 (75.8 to 89.2) | 70.7 (62.7 to 77.7) |
| Using the probability model with muscle biopsy results ncases=87; ncontrols=72 | 80.5 (70.6 to 88.2) | 90.3 (81.0 to 96.0) | 90.9 (83.1 to 95.3) | 79.3 (71.3 to 85.5) |
| Using the probability model depending on the availability of the muscle biopsy results ncases=95; ncontrols=72 | 78.9 (69.4 to 86.6) | 90.3 (81.0 to 96.0) | 91.5 (84.0 to 95.6) | 76.5 (68.6 to 82.8) |
ACR, American College of Rheumatology; EULAR, European League Against Rheumatism.