Background Selective mutism is a rare childhood anxiety disorder characterized by a consistent failure to speak in certain social situations where speech is expected, despite fluent speech in other situations. The purpose of this meta-analysis was to investigate the efficacy of psychological interventions for selective mutism in randomized controlled trials (RCTs).
Methods Five RCTs with a total of 233 participants were analysed using a random-effects model. A quality assessment of the included studies revealed that psychometrically sound measures and treatment manuals were used across all studies.
Results The results of the analyses showed psychological interventions to be more effective than no treatment, with the overall weighted effect size of g = 0.87, indicating a large mean treatment effect. This effect did not significantly differ with whether only selective mutism specific or nonselective mutism specific measures were included in the analysis.
Conclusions These findings provide support for the efficacy of psychological treatment for selective mutism. Future research could examine the effects of the successful treatments identified in this meta-analysis when compared with a psychological placebo or another bona fide treatment.
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