{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T15:56:09Z","timestamp":1782143769272,"version":"3.54.5"},"reference-count":31,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2012,1,17]],"date-time":"2012-01-17T00:00:00Z","timestamp":1326758400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Oral Rehabilitation"],"published-print":{"date-parts":[[2012,5]]},"abstract":"<jats:p><jats:bold>Summary\u2002<\/jats:bold> The aim of this study is to evaluate the validity and reliability of the Mandibular Function Impairment Questionnaire (MFIQ) (Portuguese version). Face and content validity of the Portuguese version were performed. To assess reproducibility of the data gathered with MFIQ, it was applied to 62 individuals who completed the questionnaire on two occasions. Validity and reliability of the data gathered with MFIQ were evaluated in a sample of 249 patients. Construct\u2010related validity was assessed through factorial validity (by means of a confirmatory factor analysis), and convergent and discriminant validities were assessed, respectively, by the average variance extracted (AVE), composite reliability (CC) and bivariate correlations between factors. The internal consistency was estimated by the standardised Cronbach\u2019s alpha coefficient (\u03b1) and reproducibility by the intra\u2010class correlation coefficient (ICC). All the items of MFIQ showed content validity. Reproducibility was excellent in both the \u2018functional capacity\u2019 dimension (D1) (ICC<jats:sub>D1<\/jats:sub>\u2003=\u20030\u00b7895, 95% CI\u2003=\u20030\u00b7832 to 0\u00b7935) and the \u2018feeding\u2019 dimension (D2) (ICC<jats:sub>D2<\/jats:sub>\u2003=\u20030\u00b7825, 95% CI\u2003= 0\u00b7726 to 0\u00b7891). Items 1, 2, 6 and 7 of D1 had factor weights below the desired cut\u2010off (0\u00b75), and overall fit of the original bifactorial structure of the MFIQ was poor [(confirmatory fit index) CFI\u2003= 0\u00b7850, (goodness of fit index) GFI\u2003= 0\u00b7781, (root mean square error of approximation) RMSEA\u2003= 0\u00b7118]. Thus, these items were excluded, and the new, reduced version of the MFIQ showed good fit (CFI\u2003=\u20030\u00b7933, GFI\u2003=\u20030\u00b7879, RMSEA\u2003=\u20030\u00b7099). The convergent validity was adequate (AVE\u2003\u2265\u20030\u00b75, CC\u2003\u2265\u20030\u00b77) for both factors. However, their discriminant validity was low (AVE<jats:sub>D1\u2003<\/jats:sub>\u2003=\u2003<jats:sub>\u2003<\/jats:sub>0\u00b751 and AVE<jats:sub>D2<\/jats:sub>\u2003= 0\u00b766 &lt;\u2003\u03c1<jats:sup>2<\/jats:sup><jats:sub>D1D2<\/jats:sub>\u2003=\u20030\u00b770). The internal consistency was excellent (\u03b1<jats:sub>D1<\/jats:sub>\u2003=\u20030\u00b7874; \u03b1<jats:sub>D2<\/jats:sub>\u2003=\u20030\u00b7918). The Portuguese version of the reduced MFIQ produced data with good validity and reliability.<\/jats:p>","DOI":"10.1111\/j.1365-2842.2011.02276.x","type":"journal-article","created":{"date-parts":[[2012,1,17]],"date-time":"2012-01-17T18:59:36Z","timestamp":1326826776000},"page":"377-383","source":"Crossref","is-referenced-by-count":37,"title":["Validity and reliability of the Portuguese version of Mandibular Function Impairment Questionnaire"],"prefix":"10.1111","volume":"39","author":[{"given":"J. A. D. 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