Table 1.
Demographics of the four European cohorts studied.
| Cohort | United Kingdom | Czech Republic | Hungary | Sweden | Total | |
|---|---|---|---|---|---|---|
| Number | 996 | 276 | 247 | 118 | 1637 | |
| Gender | Female (%) | 67.1 | 75.5 | 76.5 | 69.5 | 69.6 |
| Male (%) | 31.8 | 20.5 | 23.5 | 30.5 | 29.1 | |
| Not Known (%) | 1.1 | 4.0 | 0.0 | 0.0 | 1.3 | |
| Median age at onset (IQR) | 51 (39–61) | 61 (50–68) | N/A | N/A | 52 (39–63) | |
| Ethnic Group | Caucasian (%) | 81.6 | 92.8 | 99.2 | 98.3 | 87.4 |
| Non-Caucasian (%) | 11.1 | 0.0 | 0.0 | 1.7 | 6.9 | |
| Not Known (%) | 7.2 | 7.2 | 0.8 | 0.0 | 5.7 | |
| Subset | DM (%) | 46.3 | 56.9 | 31.2 | 44.9 | 45.7 |
| PM (%) | 53.7 | 43.1 | 68.8 | 55.1 | 54.3 | |
N/A: Not available, IQR: Inter-quartile range, DM: Dermatomyositis, PM: Polymyositis.