A Validation Study Of The Malocclusion Impact Questionnaire To Measure Oral Health-Related Quality Of Life In Young Arabs With Malocclusion
Ali Mohamed, Mohamed
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The study aims translate, culturally adapt and validate the Malocclusion Impact Questionnaire (MIQ) in a sample of Arab adolescents with malocclusion. After translation according to current guidelines, the comprehensiveness of the Arab version of MIQ (MIQ-AR) was verified in a pilot study of 20 Arab adolescents. The current main study was undertaken on a sample of 193 native Arab speakers, aged 10-16 years, presenting for an initial orthodontic consultation appointment. The Child Perceptions Questionnaire short version (CPQ11-14 ISF-16), which has been already validated for use in the Arabic language, was used to investigate criterion validity. Thirty-nine adolescents completed the same questionnaires (MIQ-AR and CPQ11-14 ISF-16) a second time after three weeks in order to test the repeatability of the measurements. Cronbach’s alpha was used to test the internal consistency/reliability and Spearman’s rho for the criterion validity and test-retest reliability. Statistical tests were undertaken using SPSS. The MIQ-AR presented high internal consistency (Cronbach’s alpha= 0.927>0.70) and a very satisfactory Discrimination Index (DI=0.63>0.30). A positive, very strong, and statistically significant correlation was found between the total scores of the MIQ-AR scale and the CPQ11-14 ISF-16 scale (rho=0.710, p<0.001). Test-retest reliability was at a high level (rho=0.904, p<0.001). The MIQ-AR exhibits good psychometric properties in terms of validity and reliability and seems to be a reliable instrument to assess the impact of malocclusion on the Oral Health-Related Quality of Life in Arab adolescents. However, these findings should be interpreted with caution, as they may be limited to a population similar to the study sample. Further testing of the measure is required in a variety of environments.