Further development of the intolerance of uncertainty model of GAD: a case series

Intolerance of uncertainty (IoU) is important in the development and maintenance of worry and generalized anxiety disorder (GAD; Dugas et al., 1997). However, it remains unclear why some people respond so negatively to uncertainty and have poor clinical outcomes. We adapted the IoU model to include the influence of developmental and/or attachment factors, and their possible importance to intolerability of uncertainty and associated hypothetical worries. Seven consecutive GAD referrals for CBT were naturalistically treated with the novel approach. All participants completed the 7-item Generalized Anxiety Disorder Scale (GAD-7; Spitzer et al., 2006), the Penn State Worry Questionnaire (PSWQ; Meyer et al., 1990), as well as a novel 10-item Premonition Bias Questionnaire (PBQ; C. Chigwedere et al., unpublished). From pre- to post-treatment, results for both GAD (p=.001) and worry (p=.005) improved significantly. Clinically significant change or a post-treatment score within the normal population range were observed for both the GAD-7 and PSWQ. The change in believability of worry, measured on the PBQ was also significant from pre- to post-treatment (p=.008). Overall, the novel approach may be an alternative approach to treating GAD, with some potential, both as an adjunctive or standalone treatment. However, this is a small case series and the presented novel approach requires empirical support and evaluation in larger experimental studies.