Abstract
This study aimed to translate and adapt the Malocclusion Impact Questionnaire (MIQ) into Finnish; to estimate its psychometric properties when applied to Finnish adolescents; and to estimate the effect of demographic characteristics on the perceived impact of malocclusion. The Finnish version of MIQ (MIQ-Fi) was established through translation, back-translation, and a pilot study. Psychometric properties were estimated using factorial validity (confirmatory factor analysis [CFA]), convergent validity (Average Variance Extracted [AVE]), and reliability (αordinal and ω). Structural Equation Model estimated the effect of demographic characteristics on malocclusion impact. A total of 268 Finnish adolescents participated in the study (mean age=13.4 [standard deviation, SD=1.5] years, 48.5% girls). MIQ-Fi factor model presented an adequate fit to the data after refinements (CFA: comparative fit index [CFI]=0.96, Tucker-Lewis index [TLI]=0.95, standardized root mean square residual [SRMR]=0.08, exclusion of 4 items and 1 correlation between items error). Convergent validity (AVE=0.61) and reliability (αordinal and ω≥0.90) were adequate. Gender and self-reported need for orthodontic treatment had moderate effects on malocclusion impact (βstandardized=0.36 and 0.30, respectively, p<0.01), while other demographic characteristics had weak effects (βstandardized<|0.18|, p<0.04). MIQ-Fi demonstrated adequate psychometric properties and can measure malocclusion impact in Finnish adolescents. Demographic characteristics had weak to moderate effect on the malocclusion impact.
Published Version
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