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    A Bifactor Model of Intolerance of Uncertainty in Undergraduate and Clinical Samples: Do We Need to Reconsider the Two-Factor Model?

    264963.pdf (228.7Kb)
    Access Status
    Open access
    Authors
    Shihata, S.
    McEvoy, Peter
    Mullan, Barbara
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Shihata, S. and McEvoy, P. and Mullan, B. 2018. A Bifactor Model of Intolerance of Uncertainty in Undergraduate and Clinical Samples: Do We Need to Reconsider the Two-Factor Model? Psychological Assessment. 30 (7): pp. 893-903.
    Source Title
    Psychological Assessment
    DOI
    10.1037/pas0000540
    ISSN
    1040-3590
    School
    School of Psychology
    Remarks

    Copyright © American Psychological Association, 2018. This paper is not the copy of record and may not exactly replicate the authoritative document published in the APA journal. Please do not copy or cite without author's permission. The final article is available, upon publication, at: 10.1037/pas0000540

    URI
    http://hdl.handle.net/20.500.11937/66716
    Collection
    • Curtin Research Publications
    Abstract

    The theorized role that intolerance of uncertainty (IU) plays in the acquisition, maintenance, and treatment of multiple emotional disorders underscores the importance of valid assessment tools. Research using the Intolerance of Uncertainty Scale-Short form (IUS-12) has conceptualized IU along 2 dimensions, namely, prospective IU and inhibitory IU. However, recent research has cast doubt on the separability of these dimensions. The aim of the current study was to evaluate the fit of competing measurement models of the IUS-12 in separate undergraduate (N = 506) and clinical (N = 524) samples. Unidimensional, correlated 2-factor, and bifactor models were tested using confirmatory factor analysis. The results of both studies supported a bifactor model consisting of a strong general IU factor. The general IU factor explained the majority of unique variance in the IUS-12, and suggested that a total score is generally appropriate for assessing IU. The general IU factor was most strongly and consistently associated with symptoms of multiple disorders. The inhibitory IU group factor was more weakly associated with most symptom measures in the clinical sample, but only with social phobia symptoms in the undergraduate sample. The prospective IU group factor was only separable from the general IU factor in the undergraduate sample, and did not explain unique variance in disorder symptoms.

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