{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T18:16:08Z","timestamp":1784916968161,"version":"3.55.0"},"reference-count":56,"publisher":"MJS Publishing, Medical Journals Sweden AB","license":[{"start":{"date-parts":[[2025,1,30]],"date-time":"2025-01-30T00:00:00Z","timestamp":1738195200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["AOS"],"abstract":"<jats:p>Objectives: 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.\nMethods: 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 (\u03b1ordinal and \u03c9). Structural Equation Model estimated the effect of demographic characteristics on malocclusion impact.\nResults: A total of 268 Finnish adolescents participated in the study (mean age\u00a0=\u00a013.4 [standard deviation, SD\u00a0=\u00a01.5] years, 48.5% girls). MIQ-Fi factor model presented an adequate fit to the data after refinements (CFA: comparative fit index [CFI]\u00a0=\u00a00.96, Tucker-Lewis index [TLI]\u00a0=\u00a00.95, standardized root mean square residual [SRMR]\u00a0=\u00a00.08, exclusion of 4 items and 1 correlation between items error). Convergent validity (AVE\u00a0=\u00a00.61) and reliability (\u03b1ordinal and \u03c9\u00a0\u2265\u00a00.90) were adequate. Gender and self-reported need for orthodontic treatment had moderate effects on malocclusion impact (\u03b2standardized\u00a0=\u00a00.36 and 0.30, respectively, p\u00a0&lt;\u00a00.01), while other demographic characteristics had weak effects (\u03b2standardized\u00a0&lt;\u00a0|0.18|, p\u00a0&lt;\u00a00.04).\nConclusion: MIQ-Fi demonstrated adequate psychometric properties and can measure malocclusion impact in Finnish adolescents. 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