Aims:To outline the methods of a pragmatic patient preference trial in the Improving Access to Psychological Therapies (IAPT) programme comparing cognitive behavioural therapy guided self-help (CBT-GSH) with cognitive analytic therapy guided self-help (CAT-GSH).Method:A partially randomised patient preference trial (PRPPT) methodology. Participants will be assessed with the MINI to ascertain a diagnosis of an anxiety disorder. Treatment will be six to eight 35-minute sessions in each arm. The primary outcome measure is the Beck Anxiety Inventory (BAI), with secondary outcome measures of the IAPT minimum dataset and indices of service utilisation. Participants will be followed up at 8 and 24 weeks.Planned analyses:Choice, treatment completion, drop-out and step-up rates will be summarised via a CONSORT diagram. If there are no differences between randomised and preference participants within each form of GSH, then these groups will be collapsed to form a two-arm trial. The primary analysis will compare between-arm standardised effect sizes on the BAI measure, using Cohen’s d+ at 8- and 24-week follow-up. The proportions in each arm achieving reliable and clinical change on the BAI will be established, with interviews exploring the change process with participants achieving a reliable pre–post change on the GAD-7.Conclusions:The utility of patient preference trials in mental health services are discussed and the necessary further development of robust evidence concerning low-intensity interventions is highlighted.

中文翻译：

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认知行为与认知分析指导的焦虑症自助的务实患者偏好试验

目的：概述在改善获得心理治疗 (IAPT) 项目中实用的患者偏好试验方法，比较认知行为治疗指导的自助 (CBT-GSH) 和认知分析治疗指导的自助 (CAT-GSH)。方法：部分随机患者偏好试验（PRPPT）方法。参与者将使用 MINI 进行评估，以确定焦虑症的诊断。治疗将是每组 6 到 8 个 35 分钟的疗程。主要结果测量是贝克焦虑量表（BAI），次要结果测量是 IAPT 最小数据集和服务利用指数。参与者将在第 8 周和第 24 周进行随访。计划分析：选择、治疗完成、退出和升压率将通过 CONSORT 图表进行总结。如果在每种形式的 GSH 中随机参与者和偏好参与者之间没有差异，那么这些组将被折叠以形成双臂试验。主要分析将使用 Cohen's 比较 BAI 测量的臂间标准化效应大小d+在 8 周和 24 周的随访中。将确定每个手臂在 BAI 上实现可靠和临床变化的比例，并通过访谈探索变化过程，参与者在 GAD-7 上实现可靠的前后变化。结论：患者偏好试验在心理健康服务中的效用讨论并强调了有关低强度干预的有力证据的必要进一步发展。