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Latent structure of irritable bowel syndrome symptom severity

World Journal of Gastroenterology 2015年第1期21卷 292-300页

作者： fabian jasper Boris Egloff Andrea Roalfe Michael Witthft Department of Psychological Diagnostics University of Salzburg5020 SalzburgAustria Department of Personality Psychology and Diagnostics University of Mainz55099 MainzGermany Primary Care Clinical Sciences University of BirminghamEdgbastonBirmingham B15 2TTUnited Kingdom Department of Health Psychology University of Mannheim68161 MannheimGermany

AIM: To investigate the latent structure of an irritable bowel syndrome(IBS) symptom severity scale in a population of healthy ***: The Birmingham IBS symptom questionnaire which consists of three symptom specific scales(diarrhea,constipation,pain) was evaluated by meansof structural equation *** compared the original 3-factor solution to a general factor model and a bifactor solution in a large internet sample of college students(n = 875).Statistical comparisons of competing models were conducted by means of χ2 difference *** the evaluation of model fit,we examined the comparative fit index(CFI) and the Root Mean Square Error of Approximation(RMSEA).RESULTS: Results clearly favored a bifactor model of IBS symptom severity(CFI = 0.99,RMSEA = 0.05) which consisted of a strong general IBS somatization factor and three symptom specific factors(diarrhea,constipation,pain) based on the subscales of the Birmingham IBS symptom *** fit indices of the competing one factor model(CFI = 0.85,RMSEA = 0.17) and three factor model(CFI = 0.97,RMSEA = 0.08) were clearly inferior.χ2 difference tests showed that the differences between the models were indeed significant in favor of the bifactor model(P < 0.001).Correlations of the four latent factors with measures of pain sensitivity,somatoform dissociation,fatigue severity,and demographic variables support the validity of our bifactor model of IBS specific symptom ***: The findings suggest that IBS symptom severity might best be understood as a continuous and multidimensional construct which can be reliably and validly assessed with the B-IBS.

关键词： Irritable bowel syndrome Bifactor Gastrointestinal

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