Table 1:
Baseline characteristics and patient demographics
| Variable | Inclusion body myositis (n = 38) | Controls (n = 22) |
|---|---|---|
| Age at biopsy (years) | 62.6 (9) | 59.7 (10) |
| Sex: | ||
| Females | 19 (50) | 11 (50) |
| Males | 19 (50) | 11 (50) |
| Race: | ||
| American Indian/Alaskan Native | 1 (2.6) | 1 (4.5) |
| Black | 1 (2.6) | 0 |
| White | 32 (84.2) | 19 (86.4) |
| Unknown/not disclosed | 4 (10.5) | 2 (9.1) |
| Biopsy target | ||
| Quadriceps | 14 (36.8) | 8 (36.4) |
| Biceps brachii | 9 (23.7) | 5 (22.7) |
| Triceps brachii | 10 (26.3) | 3 (13.6) |
| Others | 5 (13.2) | 6 (27.3) |
| Disease characteristics | ||
| Disease duration at time of the biopsy (years) | 6.1 (4) | NA |
| Manual Motor Test score | 16.6 (9.4) | 0 |
| Patients requiring any type of walking assistance at time of the biopsy | 4 (10.5) | 0 |
Continuous variables are displayed as mean (SD) and categorical variables as number of patients (percentage). NA: not applicable.