| Ref (type) | Population | Outcome, Interventions | Results and statistical analysis | Effect size | Favours |
| Quality of life | |||||
|
RCT |
31 adults with adductor spasmodic dysphonia |
Voice-related quality of life
with voice therapy plus botulinum A toxin with sham voice therapy plus botulinum A toxin with botulinum A toxin-only Absolute results not reported |
Reported as not significant P value not provided Statistical analysis not clear |
Not significant |
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