Table 1.
Clinical features of DM/PM patients and healthy controls.
| Cases | Controls | |||
|---|---|---|---|---|
| Number/total | % | Number/total | % | |
| Mean age | 46.1 ± 15.2 | 41.8 ± 12.7 | ||
| Male | 261/1017 | 25.7 | 165/1280 | 12.9 |
| Female | 756/1017 | 74.3 | 1115/1280 | 87.1 |
| DM | 654/1017 | 64.3 | — | — |
| PM | 363/1017 | 35.7 | — | — |
| ILD | 585/1017 | 57.5 | — | — |
| DM with ILD | 390/1017 | 38.3 | — | — |
| PM with ILD | 195/1017 | 19.2 | — | — |
| Anti-Jo-1 antibody | 115/659 | 17.5 | — | — |
| DM with anti-Jo-1 antibody | 61/438 | 13.9 | — | — |
| PM with anti-Jo-1 antibody | 54/221 | 24.4 | — | — |
| Malignancy | 14/287 | 4.9 | — | — |
| Lung cancer | 6/14 | 42.9 | — | — |
| Breast cancer | 3/14 | 21.4 | — | — |
| Ovarian cancer | 2/14 | 14.3 | — | — |
| Liver cancer | 1/14 | 7.1 | — | — |
| Nasopharynx cancer | 1/14 | 7.1 | — | — |
| Synovial sarcoma | 1/14 | 7.1 | — | — |
DM = dermatomyositis; PM = polymyositis; ILD = interstitial lung disease.