Measurement of adverse effects of psychological therapy is inconsistent due to ambiguity about the concept. The perspective of people undertaking psychological therapy (that is, experts by experience) has largely been overlooked. This study will investigate whether there is consensus between the opinions of professionals and experts by experience. The Delphi method was used. In Round 1 thematic analysis was used to analyse qualitative responses. Wilcoxon rank-sum tests were used to examine group differences in Rounds 2 and 3. The study protocol was prospectively registered, reference osf.io/f9wp7. Fifty-one professionals and 51 experts by experience generated 147 potential adverse effects in Round 1, across 9 themes; including ‘therapy amplifies problem’, ‘emotional lability’ and ‘sense of self’. Each item was rated for overall consensus in Rounds 2 (n = 62) and 3 (n = 63). Thirty-eight items were rated as essential, very important or important to include on a list of potential adverse effects. A further 12 items were rated as important by the expert by experience group only. Professionals were more conservative in their ratings. There appeared to be consensus between professionals and experts by experience on what to include in a list of adverse effects of psychological therapy (the EDAPT), including novel adverse effects which have not been previously considered. Further research is required to understand which adverse effects are necessary, unnecessary, or indeed harmful to psychotherapy outcomes.

中文翻译：

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辨别心理治疗的副作用：经验专家与治疗师的共识

由于概念模糊，对心理治疗的不良影响的测量不一致。接受心理治疗的人（即经验丰富的专家）的观点在很大程度上被忽视了。本研究将根据经验调查专业人士和专家的意见是否达成共识。使用了德尔菲法。在第 1 轮中，主题分析用于分析定性反应。Wilcoxon 秩和检验用于检查第 2 轮和第 3 轮的组间差异。研究方案是前瞻性注册的，参考 osf.io/f9wp7。51 位专业人士和 51 位经验丰富的专家在第一轮中产生了 147 种潜在不利影响，涉及 9 个主题；包括“治疗放大问题”、“情绪不稳定”和“自我意识”。n  = 62) 和 3 ( n  = 63)。38 个项目被评为基本、非常重要或重要，以列入潜在不利影响清单。专家仅按经验组将另外 12 个项目评为重要项目。专业人士的评级更为保守。根据经验，专业人士和专家之间似乎就心理治疗的不良反应（EDAPT）清单中包括哪些内容达成了共识，包括以前没有考虑过的新的不良反应。需要进一步的研究来了解哪些不良反应是必要的、不必要的或确实对心理治疗结果有害。