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IPQ-factor anal.

IPQ-factor anal. - Psychology and Health April 2005 20(2...

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Psychology and Health April, 2005, 20(2): 161–173 A confirmatory factor analysis of the revised illness perception questionnaire (IPQ-R) in a cervical screening context MARTIN S. HAGGER, & SHEINA ORBELL Department of Psychology, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom (Received 13 November 2003; in final form 4 November 2004) Abstract The purpose of the present study was to test the factorial and discriminant validity of the Revised Illness Perception Questionnaire (IPQ-R), a measure of illness representations based on Leventhal, Meyer and Nerenz’s Self-Regulation Theory, in a cervical screening context using confirmatory factor analysis. Six hundred and sixty women, who had attended a colposcopy clinic and were invited to re-attend, completed the IPQ-R. Data were analysed using covariance structure analysis. The adequacy of an a priori confirmatory factor analytic model that included seven dimensions of the cognitive illness representation: identity, timeline-acute/chronic, serious consequences, personal control, treatment control, illness coherence, and causal attributions, and one emotional representation factor was tested against the observed data. After the elimination of two items responsible for large standardised residuals and with low factor loadings, the model adequately accounted for covariances among the IPQ-R items according to multiple criteria for goodness-of-fit. Factor inter-correlations supported the discriminant validity of the constructs and the factors exhibited satisfactory composite reliability. A theoretically predictable pattern of relationships among the representa- tion dimensions was evident. In particular, the control-related constructs and the illness coherence dimension were negatively related to other illness representation constructs. The present study provided confirmatory evidence using a robust hypothesis-testing framework to support the proposed structure of the illness representation dimensions in a cervical screening context. Keywords: Self-regulation theory, common-sense model, illness cognitions, validity, colposcopy Correspondence: Martin S. Hagger, Department of Psychology, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom. E-mail: [email protected] ISSN 0887-0446 print/ISSN 1476-8321 online ß 2005 Taylor & Francis Group Ltd DOI: 10.1080/0887044042000334724
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Introduction There has been a recent resurgence of interest in Leventhal, Meyer & Nerenz’s (1980) self-regulation theory to explain the cognitive antecedents of coping behaviours and illness outcomes in chronic illness (Hagger & Orbell, 2003). This has been coupled with recent advances in self-report measurement instruments designed to tap the key variables associated with illness representations, such as the Illness Perception Questionnaire (IPQ; Weinman, Petrie, Moss-Morris & Horne, 1996) and the Revised Illness Perception Questionnaire (IPQ-R; Moss-Morris et al., 2002). While these instruments are considered the measure of choice in recent studies on self- regulation theory (e.g., Brewer, Chapman, Brownlee & Leventhal, 2002; Hagger,
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