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Psychometric validation of the Chinese version of the Illness Perception Questionnaire–Revised for women with stress urinary incontinence
Author(s) -
Fan Yijun,
Huang Zhaohui,
Zhang Dazhao,
Chang Jun,
Jia Yun,
He Shuihong,
Wei Bing
Publication year - 2017
Publication title -
journal of obstetrics and gynaecology research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 50
eISSN - 1447-0756
pISSN - 1341-8076
DOI - 10.1111/jog.13351
Subject(s) - medicine , urinary incontinence , perception , clinical psychology , physical therapy , urology , psychology , neuroscience
Aim The aim of this study was to examine the reliability and validity of the Illness Perception Questionnaire–Revised (IPQ‐R) in patients with stress urinary incontinence (SUI). Methods A total of 256 patients with SUI and 76 patients with myoma of the uterus were recruited to complete the Chinese IPQ‐R. For the reliability, the key tests included Cronbach's α coefficient and intraclass correlation coefficients. For the validity, the key tests included factor analysis, Spearman's correlation coefficient, and the Student's t ‐test. Results Cronbach's α values ranged from 0.68 to 0.90 for each subscale and the intraclass correlation coefficients ranged from 0.80 to 0.94. The results of the confirmatory factor analysis showed that the seven‐factor structure as proposed by the original IPQ‐R fit the data poorly. Although removal of three items improved the model's fit, the goodness‐of‐fit statistics were still below acceptable standards. We identified an acceptable seven‐factor solution from the 38 items on Illness Beliefs using an exploratory factor analysis (EFA), which accounted for 68.12% of the variance. For the concurrent validity, Consequences and Emotional Representation both had good correlations with anxiety and depression ( r = 0.52–0.62) and better quality of life ( r = 0.58–0.73). The inter‐correlation coefficient of the seven factors ranged from 0.05 to 0.59, suggesting acceptable discriminant validity. There were significant differences on the scale scores of Disease Identity ( t = 9.39, P < 0.01), Timeline–Acute/Chronic ( t = 3.69, P < 0.01), Consequences ( t = 4.53, P < 0.01), Illness Coherence ( t = 7.73, P < 0.01), Timeline–Cyclical ( t = 6.48, P < 0.01), Emotional Representation ( t = 6.40, P < 0.01), and Cause ( t = 4.29, P < 0.01) between the patients with SUI and with myoma of the uterus, which also indicated acceptable discriminant validity. Conclusion The findings of this study supported the Chinese IPQ‐R as being a reliable and valid tool for measuring illness perception among patients with SUI.