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Validation of the Chinese version of the Malocclusion Impact Questionnaire (MIQ)
Meng-Ying Li1,2,3, Song-Lin He4,5,6, Jin-Hua Wang7,8,9
1College of Stomatology, Chongqing Medical University, No. 7 Shangqingsi Road, Chongqing, 400015, China.
Objective:
To translate and cross-culturally adapt the Malocclusion Impact Questionnaire (MIQ) into Chinese and to assess the psychometric properties of the Chinese version of the MIQ (MIQ/C) for use among adolescents with malocclusion in China.
Materials And Method:
First, the MIQ/C was developed according to international guidelines. Then, the MIQ/C was filled out by 536 adolescents between 10 and 16 years of age. This study used exploratory factor analysis (EFA), confirmatory factor analysis (CFA), convergent validity, internal consistency, and test-retest reliability to evaluate the psychometric properties of the MIQ/C.
Results:
Following EFA, three domains were extracted, accounting for 65.950% of the total variance. The CFA results showed that the fit indices of each factor in the three-factor model all reached the standard (chi-square/DF = 2.591, GFI = 0.919, TLI = 0.926, CFI = 0.928, RMSEA = 0.076). The scale evidenced a good relationship with the two global questions, indicating good convergent validity. The Cronbach alpha value and the intraclass correlation coefficients (ICC) value of the MIQ/C were 0.929 and 0.893, respectively.
Conclusion:
The MIQ/C demonstrated good reliability and validity and can be further studied and applied in Chinese adolescents with malocclusion.
Clinical Relevance:
The MIQ/C can be applied to assess the psychosocial impact of malocclusion among Chinese adolescents.
