Purpose The Lidcombe Program is an efficacious and effective intervention for early stuttering. The treatment is based on parent verbal response contingent stimulation procedures, which are assumed to be responsible for treatment effect. The present trial tested this assumption. Method The design was a parallel, open plan, noninferiority randomized controlled trial. In the experimental arm, the five Lidcombe Program verbal contingencies were removed from parent instruction. The primary outcome was beyond-clinic percentage syllables stuttered at 18-month follow-up. Seventy-four children and their parents were randomized to one of the two treatment arms. Results Findings of noninferiority were inconclusive for the primary outcome of stuttering severity, based on a margin of 1.0 percentage syllables stuttered. Conclusions The inconclusive finding of noninferiority means it is possible that verbal contingencies make some contribution to the Lidcombe Program treatment effect. However, considering all primary and secondary outcomes, an overriding impression from the trial is a similarity of outcomes between the control and experimental arms. The clinical applications of the trial are discussed, along with further research that is needed.

中文翻译：

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利德科姆计划中的言语意外事件：非劣效性试验

目的利德科姆计划是针对早期口吃的有效干预措施。治疗是基于父母的言语反应或刺激程序，这被认为是治疗效果的原因。目前的试验验证了这一假设。 方法该设计是一项平行、开放式、非劣效性随机对照试验。在实验组中，五种利德科姆计划的口头意外事件从家长指导中删除。主要结果是 18 个月随访时临床外口吃的音节百分比。七十四名儿童及其父母被随机分配到两个治疗组之一。 结果基于 1.0% 的口吃音节百分比，非劣效性结果对于口吃严重程度的主要结果并无结论。 结论非劣效性的非结论性发现意味着口头意外事件可能对利德科姆计划的治疗效果做出一些贡献。然而，考虑到所有主要和次要结果，试验的最重要的印象是对照组和实验组之间的结果相似。讨论了该试验的临床应用以及需要的进一步研究。