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Validity and Reliability of the Turkish Version of Mandibular Function Impairment Questionnaire
Nazım Tolgahan Yıldız1, Afra Alkan2, Bahar Anaforoğlu Külünkoğlu3
1Faculty of Physical Therapy and Rehabilitation, Hacettepe University, Ankara, Turkey.
Objective:
To assess the validity and reliability of the Turkish version of the Mandibular Function Impairment Questionnaire (MFIQ-TR).
Methods:
Included in this study were 248 patients diagnosed with temporomandibular disorder (TMD) according to Diagnostic Criteria for TMD Axis I protocol. Construct-related validity was evaluated through internal and external construct validity; convergent and divergent validities were evaluated by the average variance extracted (AVE), composite reliability (CR), and bivariate correlations between factors. Reliability was assessed by internal consistency and test-retest reliability.
Results:
All items of the MFIQ-TR had content validity and factor loadings above 0.5. The model statistics indicated a good fit. The convergent validity was very good (AVE > 0.5 and CR > 0.7), and the discriminant validity was satisfied. Internal consistency and test-retest reliability of the MFIQ-TR were excellent.
Conclusion:
The MFIQ-TR is a valid and reliable instrument for evaluating the impairment of mandibular function in Turkish patients with TMD.
