Summary of diagnostic criteria met in patients included for analysis
| Diagnostic criteria met | Anti-cN-1A positive (%) | Total (all patients) |
|---|---|---|
| Medical Research Council Criteria 201010 | ||
| Pathologically defined IBM | 13 (31.7) | 41 |
| Clinically defined IBM | 39 (39.4) | 99 |
| Possible IBM | 28 (33.3) | 84 |
| Griggs et al9 Criteria | ||
| Definite IBM | 19 (40.4) | 47 |
| Possible IBM | 61 (32.3) | 189 |
| European Neuromuscular Centre Criteria 199711 | ||
| Definite IBM | 7 (31.8) | 22 |
| Probable IBM | 0 (0.0) | 2 |
| Total unique patients* | 102 (32.8) | 311 |
*Some patients fulfilled multiple diagnostic criteria. Not all patients were assessed by each criterion. Of the total, 152 patients met only one criterion, 143 patients met two criteria and 16 patients met all three criteria.
Anti-cN-1A, anticytosolic 5′-nucleotidase 1A; IBM, inclusion body myositis.