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首页> 外文期刊>Journal of psychosomatic research >Psychometric evaluation of the Revised Illness Perception Questionnaire (IPQ-R) in cancer patients: Confirmatory factor analysis and Rasch analysis
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Psychometric evaluation of the Revised Illness Perception Questionnaire (IPQ-R) in cancer patients: Confirmatory factor analysis and Rasch analysis

机译：修订版的癌症患者疾病知觉调查表（IPQ-R）的心理计量学评估：验证性因素分析和Rasch分析

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Objective: To provide new insights into the psychometrics of the revised Illness Perception Questionnaire (IPQ-R) in cancer patients. To undertake, for the first time using data from breast, colorectal and prostate cancer patients, a confirmatory factor analysis (CFA) to assess the validity of the IPQ-R's core seven-factor structure. Also, for the first time in any illness group, to undertake Rasch analysis to explore the extent to which the IPQ-R factors form unidimensional scales, with linear measurement properties and no Differential Item Functioning (DIF). Methods: Patients with potentially curable breast, colorectal or prostate cancer, within 6. months post-diagnosis, completed the IPQ-R online ( N= 531). CFA was conducted, including multi-sample analysis, and for each IPQ-R factor fit to the Rasch model was assessed by examining, amongst other things, item fit, DIF and unidimensionality. Results: The CFA showed a moderate fit of the data to the IPQ-R model, and stability across diagnosis, although fit was significantly improved following the removal of selected items. All seven factors achieved fit to the Rasch model, and exhibited unidimensionality and minimal DIF, although in most cases this was after some item rescoring and/or deletion. In both analyses, IPQ-R items 12, 18 and 24 were indicated as misfitting and removed. Conclusion: Given the rigorous standard of Rasch measurement, and the generic nature of the IPQ-R, it stood up well to the demands of the Rasch model in this study. Importantly, the results show that with some relatively minor, pragmatic modifications the IPQ-R could possess Rasch-standard measurement in cancer patients.
机译：目的：为癌症患者修订后的疾病知觉调查表（IPQ-R）的心理计量学提供新的见解。首次使用乳腺癌，结肠直肠癌和前列腺癌患者的数据进行验证性因子分析（CFA），以评估IPQ-R核心七因子结构的有效性。同样，在任何疾病组中，第一次进行Rasch分析，以探讨IPQ-R因子形成具有线性测量属性且无差异项功能（DIF）的一维标度的程度。方法：具有潜在可治愈的乳腺癌，结肠直肠癌或前列腺癌的患者，在诊断后的6个月内在线完成IPQ-R（N = 531）。进行了CFA，包括多样本分析，并且通过检查项目拟合，DIF和一维性等因素，评估了与Rasch模型拟合的每个IPQ-R因子。结果：CFA显示数据与IPQ-R模型的拟合程度适中，并且在整个诊断过程中均具有稳定性，尽管去除选定项目后拟合度显着提高。所有这七个因素都达到了Rasch模型的要求，并表现出一维性和最小DIF，尽管在大多数情况下，这是在对某些物品进行记录和/或删除之后。在这两项分析中，IPQ-R项目12、18和24均显示为不合适并已删除。结论：鉴于Rasch测量的严格标准以及IPQ-R的通用性质，它可以很好地满足本研究中Rasch模型的要求。重要的是，结果表明，通过进行一些相对较小的实用修改，IPQ-R可以在癌症患者中拥有Rasch标准测量。

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