DomainActivity levelDescription
Muscular
Exclusion of weakness due to corticosteroids
No=0Absence of currently active muscular involvement
Low=6Mild active myositis shown by abnormal EMG, MRI* or biopsy with no weakness and creatine kinase (N≤CK≤2N)
Moderate=12Moderately active myositis proven by abnormal EMG, MRI* or biopsy with weakness (maximal deficit of 4/5), or elevated creatine kinase (2N<CK≤4N),
High=18Highly active myositis shown by abnormal EMG, MRI* or biopsy with weakness (deficit ≤3/5) or elevated creatine kinase (>4N)
  • *We decided to add this item not included in the initial version since the value of this examination for the diagnosis of myositis was not clear until recently.

  • EMG, electromyogram.