Characteristic | USA, n = 543 | Sweden, n = 49 | South Korea, n = 51 | Total, n = 643 | p |
---|---|---|---|---|---|
Age, yrs, mean ± SD | 54.2 ± 13.0 | 62.6 ± 11.8 | 49.7 ± 14.1 | 54.5 ± 13.3 | 0.001 |
Female, n (%) | 446 (82.1) | 36 (73.5) | 40 (78.4) | 522 (81.2) | 0.289 |
DM, n (%) | 283 (52.1) | 26 (53.1) | 44 (86.3) | 353 (54.9) | < 0.001 |
Disease duration, yrs, mean ± SD | 7.9 ± 7.3 | 10.1 ± 10.1 | 7.8 ± 7.3 | 8.1 ± 7.8 | 0.170 |
DM: dermatomyositis.