Ages, disease duration, and sex ratio of writer's cramp group and control groups
| Age range (y) |
Mean age (SD) (y) |
Disease duration range (y) | Mean duration (SD) (y) | Sex ratio (male/female) | |
| Writer's cramp | 21–70 | 42.6 (16.5) | 1–9 | 4 (2.6) | 8/4 |
| Disease control | 22–66 | 44.9 (16.2) | 1–5 | 2 (1.6) | 7/5 |
| Normal control | 22–70 | 43.1 (16) | — | — | 6/6 |