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N, number of patients; SD, standard deviation
| Variable | Botulinum toxin (N=10) | Placebo (N=10) | Both groups (N=20) |
| Age: mean ± SD (years) | 29.64±6.75 | 30.21±7.3 | 29.81±7.12 |
| Duration of complaint: mean + SD (years) | 6.73± 6.1 | 8.27±5.38 | 7.33±4.85 |
| Sex, N (%) | |||
| Male | 3 (30%) | 4 (40%) | 7 (35%) |
| Female | 7 (70%) | 6 (60%) | 13 (65%) |
