Validity and Reliability of the Turkish Version of Mandibular Function Impairment Questionnaire

ABSTRACT

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.

KEYWORDS:

• Temporomandibular disorders
• validity
• reliability
• mandibular function impairment questionnaire
• severity
• pain

Acknowledgments

The authors thank Prof. Dr. İlkay PEKER (DDS, Ph.D., Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Gazi University, Ankara, Turkey) for her contribution in conducting the examination of TMD patients and making the diagnosis of TMD.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data that support the findings of this study are available by e-mail from the corresponding author upon reasonable request..

Authors’ contributions

NTY contributed to data acquisition, conception, design, data interpretation, and drafted and critically revised the manuscript. AA contributed to conception, design and data interpretation, performed statistical analysis, and drafted and critically revised the manuscript. BAK contributed to conception, design, data interpretation, and drafted and critically revised the manuscript. All authors approved the final version of the manuscript.

Supplemental data

Supplemental data for this article can be accessed on the publisher’s website.

Additional information

Funding

The author(s) reported there is no funding associated with the work featured in this article.