Responsiveness of the DHI-N was excellent, AUC = 0.83, discriminating between self-perceived 'improved' versus 'unchanged' participants. Correlations between change scores of DHI-N and other self-report measures of functional health and symptoms were high (r = 0.50 - 0.57). Satisfactory test-retest reliability was demonstrated, and the change for an individual should be ≥ 20 DHI-N points to exceed measurement error (SDD). The DHI-N demonstrated excellent ability to discriminate between participants with and without 'disability', AUC being 0.89 and best cut-off point = 29 points. Concurrent correlations between the DHI-N and other related measures were moderate to high, highest with Vertigo Symptom Scale-short form-Norwegian version (r = 0.69), and lowest with preferred gait (r = - 0.36). Acceptable internal consistency was found for the total scale (α = 0.95). Resultsįactor analysis revealed a different factor structure than the original DHI, resulting in dismissal of subscale scores in the DHI-N. Longitudinal designs were used to examine test-retest reliability (intraclass correlation coefficient (ICC) statistics, smallest detectable difference (SDD)), and responsiveness (Pearson's product moment correlation, ROC curve analysis area under the ROC curve (AUC), and minimally important change (MIC)). A cross-sectional design was used to examine the factor structure (exploratory factor analysis), internal consistency (Cronbach's α), concurrent validity (Pearson's product moment correlation r), and discriminate ability (ROC curve analysis). Two samples (n = 92 and n = 27) included participants with dizziness of mainly vestibular origin. The aim of the present study was to examine reliability and validity of a translated Norwegian version (DHI-N), also examining responsiveness to important change in the construct being measured. As more studies need to be done to restructure DHI, we recommend only using the total DHI score as a measure of dizziness handicap.The impact of dizziness on quality of life is often assessed by the Dizziness Handicap Inventory (DHI), which is used as a discriminate and evaluative measure. Results did not support the original subscale structure of the DHI. CONCLUSION: The DHI-L has shown good reliability and validity. The second factor comprised of items that pertained to postural instability. The first factor indicated disability in daily activities and psychological effect of handicap. Our proposed two-factor model explained 44.5% of the variance. The ICC was excellent for the total score and its subscales. The correlations between DHI and SF-36 were high to weak. CI-TCs for DHI-L total scale ranged from 0.33 to 0.67. RESULTS: The Cronbach's alpha coefficient was very high (0.91). Finally, the factor structure of the DHI was assessed by principal component analysis (PCA). Concurrent validation was performed using Pearson correlation between the total score and subscales of DHI-L and the eight scales of Short Form-36 Health Survey (SF-36). After a week, 65 of the recruited patients were again asked to fill out Dizziness Handicap Inventory (DHI)-L to ascertain test-retest reliability (intraclass correlation, ICC). The internal consistency was measured by Cronbach's alpha coefficient and corrected item-total correlations (CI-TCs). A total of 108 patients (75.9% women), mean age 51.9 years, with peripheral or central dizziness and vertigo participated in our cross-sectional study. MATERIALS and METHODS: A standard protocol of translation was followed for psychometric instruments. Abstract : OBJECTIVES: This study aimed to validate the Lithuanian version of the Dizziness Handicap Inventory (DHI-L), investigate its reliability, and perform factor analysis.
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