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| Methods | Double‐blinded, cross‐over, placebo‐controlled, random assignment | |
| Participants | 13 adductor spasmodic dysphonia | |
| Interventions | Bilateral thyroarytenoid muscle injections of 2.5 U Botox or 2.5 U saline | |
| Outcomes | Fo MPT Fo range Pertubation Spectrographic analysis Perceptual ratings | |
| Notes | — | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment? | Unclear risk | B ‐ Unclear |
