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| Disease duration (years) | 16.1 (11.6) |
| BTX treatment duration (years) | 10.6 (7.6) |
| TWSTRS total score (max. = 85) | 31.1 (12.4) |
| Torticollis severity Scale (max. = 35) | 15.9 (4.2) |
| Disability scale (max. = 30) | 9.6 (6.5) |
| Pain scale (max. = 20) | 5.6 (5.3) |
Values are expressed as means, with the standard deviation within parenthesis.
TWSTRS, Toronto Western Spasmodic Torticollis Rating Scale; BTX, Botulinum Toxin.
