Clinical characteristics of patients with PM/DM. Values are n (%) unless otherwise specified.
| Characteristics | PM, n = 70 | DM, n = 104 | p |
|---|---|---|---|
| Mean age at diagnosis, yrs | 54.8 | 50.2 | ns |
| Male/female, n | 36/34 | 26/78 | ns |
| Anti-MDA5–positive | 0 | 47 (45.2) | < 0.001 |
| ILD | 31 (44.3) | 66 (63.5) | ns |
| With anti-MDA5 antibodies | 0 (0.0) | 45 (42.3) | |
| Without anti-MDA5 antibodies | 31 (44.3) | 21 (20.2) |
PM: polymyositis; DM: dermatomyositis; ILD: interstitial lung disease; anti-MDA5: anti-melanoma differentiation-associated gene 5; ns: not significant.