Change in summary VGA score
| Worse | Same | Better | Total | Missing | |
| Baseline to week 2 (χ2 = 3.06 , p = 0.08) | |||||
| Placebo | 4 (24%) | 10 (59%) | 3 (18%) | 17 | 1 |
| Botulinum toxin | 1 (5%) | 12 (71%) | 7 (35%) | 20 | 2 |
| Baseline to week 6 (χ2 = 5.42, p = 0.02) | |||||
| Placebo | 4 (22%) | 11 (61%) | 3 (17%) | 18 | 0 |
| Botulinum toxin | 1 (5%) | 10 (48%) | 10 (48%) | 21 | 1 |
| Baseline to week 12 (χ2 = 8.63, p = 0.003) | |||||
| Placebo | 3 (17%) | 13 (72%) | 2 (11%) | 18 | 0 |
| Botulinum toxin | 0 | 10 (50%) | 10 (50%) | 20 | 2 |