Psychological Inflexibility (PI) is reliably associated with adverse psychological outcomes but little research has explored how PI may affect therapeutic process in psychotherapy. The current study examined the longitudinal influence of PI measured at pre-treatment on likelihood of client non-disclosure of treatment-relevant information at 15-week follow-up and evaluated PI against an empirically supported predictor of non-disclosure, internalized shame. Sixty clients in outpatient psychotherapy at an evidence-based treatment center (M_age = 35.38; 62% female) completed self-report measures of PI and internalized shame at initiation of therapy, 3- and 9-week follow-up and a dichotomous assessment of non-disclosure at 15-week follow-up. We hypothesized that pre-treatment PI and internalized shame would uniquely and positively predict likelihood of non-disclosure at 15-week follow-up. Results indicated that, when tested simultaneously, only pre-treatment PI predicted likelihood of non-disclosure at follow-up (OR = 2.96). This is the first study to test the influence of PI on client non-disclosure and implicates PI as a relevant pre-treatment individual difference variable for identifying clients at higher risk for non-disclosure in psychotherapy.

心理僵硬（PI）与不良的心理结果可靠相关，但是很少有研究探讨PI如何影响心理治疗的治疗过程。当前的研究检查了在15周随访中治疗前测量的PI对客户未披露与治疗有关的信息的可能性的纵向影响，并根据经验支持的未披露内在羞辱的预测指标评估了PI。在门诊心理治疗六十的客户以证据为基础的治疗中心（中号_年龄 =35.38; 62％的女性）在开始治疗，3周和9周的随访以及15周的随访中未披露的二分评估中完成了PI的自我报告测量和内在的羞耻感。我们假设在15周的随访中，治疗前的PI和内在的羞耻感将唯一且积极地预测未披露的可能性。结果表明，当同时进行测试时，只有治疗前PI可以预测随访时未披露的可能性（OR = 2.96）。这是第一个测试PI对客户保密的影响的研究，并且暗示PI是相关的治疗前个体差异变量，用于识别心理治疗中较高保密风险的客户。