This study investigated the effectiveness of brief individual experiential schema therapy (ST) in 12 adult outpatients with cluster C personality disorders (PD) using randomised multiple baseline design. Waitlist period was followed by five explorative sessions, 18 experiential ST sessions, two treatment follow-up (FU) booster sessions and a 6-month FU assessment. Overall well-being (ORS), behavioural treatment goals and negative core beliefs were assessed 60–91 times, global symptomatic distress (BSI) six times. PD severity (SCID-5-PD) was pre-post-analysed. Randomisation and non-parametric tests showed large significant effects (d = 1.08–2.38, r = .53–.66) on all outcomes at treatment-FU and 6-month FU assessment. This is the first study providing preliminary evidence of effectiveness of brief individual experiential ST for patients with cluster C PD, tentatively challenging the common tenet that long treatment duration is required. Due to limitations, replication is recommended.

中文翻译：

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对 C 类人格障碍成人门诊患者进行简短的个体体验式图式治疗：有效吗？

本研究采用随机多基线设计，调查了短期个体体验式图式治疗 (ST) 对 12 名患有 C 类人格障碍 (PD) 的成人门诊患者的有效性。候补期之后是 5 次探索性疗程、18 次体验式 ST 疗程、2 次治疗随访 (FU) 加强疗程和 6 个月的 FU 评估。总体幸福感 (ORS)、行为治疗目标和消极核心信念被评估 60-91 次，整体症状困扰 (BSI) 被评估 6 次。 PD 严重程度 (SCID-5-PD) 进行事前事后分析。随机化和非参数检验显示，治疗 FU 和 6 个月 FU 评估的所有结果均具有显着影响（ d  = 1.08–2.38，r =  .53–.66 ） 。这是第一项为丛集性 C PD 患者进行短暂个体体验性 ST 有效性提供初步证据的研究，初步挑战了需要较长治疗时间的共同原则。由于限制，建议复制。