Correction to: Cross-cultural adaptation, reliability, and validity of the Vertigo symptom scale-short form in the central Kurdish dialect.

The original article [1] contained a minor typo in Fig. 1 affecting the motif 'VSS-SF-CK'; this has since been corrected.

Cross-cultural adaptation, reliability, and validity of the Vertigo symptom scale-short form in the central Kurdish dialect.

BACKGROUND: Core vestibular symptoms are vague, hard for patients to describe, and difficult for examiners to quantify. Reliable and validated patient-reported outcome measures (PROMs) have obtained acceptance and popularity in the specialty of vestibular disorders. In Kurdish, there is a critical shortage of such measures. The aim of this survey was to assess the psychometric properties of a central Kurdish version (VSS - SF - CK) of the Vertigo Symptom Scale-Short Form (VSS - SF). METHODS: The study utilized a regulated process of cross-cultural adaptation to produce the VSS - SF - CK. We examined its psychometric properties by using a cross-sectional survey. Owing to a non-normal distribution, both principal axis factoring and polychoric correlation were used to examine the structure. The internal consistency of the scales was evaluated using Cronbach's alpha coefficient (α) and composite reliability. The discriminant validity was evaluated using the heterotrait-monotrait ratio of correlations (HTMT.85) and the Fornell-Larcker criterion. To assess convergent validity, the instrument was correlated with two comparators. RESULTS: The participants (n = 195) were composed of 165 patients with vestibular symptoms (mean - age 45 ± 15.8, range 61 years; 56.4% women) and 30 healthy participants (mean - age 35 ± 18.6; range 52 years; 60% women). Based on the scree plot, along with other criteria such as Horn's parallel analysis and minimum average partial, two factors were extracted: vestibular (VSS - V) and autonomic-anxiety (VSS - AA). Both constructs showed a robust structure in terms of adequate loadings and weak cross-loadings. The scales' αs were 0.81, 0.81, and 0.87 for VSS-V, VSS-AA, and the total scale (VSS - T), respectively. Discriminant validity was established with a value of 0.71 for HTMT (< 0.85). Spearman's correlation supported the study's hypotheses and confirmed the convergent validity. Intraclass correlation coefficients revealed high external reliability: test-retest results were 0.93, 0.94, and 0.97 for VSS-V, VSS - AA, and VSS - T, respectively. CONCLUSION: Given a critical shortage in PROMs for the vestibular field, the psychometric properties of VSS - SF - CK were evaluated. The results were promising, as they revealed external consistency and construct validity. The goodness of fit indices showed that the VSS - SF - CK is a reliable and validated PROM that can be used by clinicians and researchers in the Kurdish-speaking population.

Reliability and validity of a Central Kurdish version of the Dizziness Handicap Inventory.

We cross-culturally adapted the Dizziness Handicap Inventory (DHI) into Central Kurdish dialect (DHI-CK) and verified its reliability and validity. A cross-sectional study was utilised to measure the impacts of vestibular disorders. Along with the DHI-CK, two comparators were introduced: the Visual Analogue Scale and the Clinical Test of Sensory Interaction and Balance. External and internal reliability were tested with intraclass correlation coefficient (ICC) and Cronbach's alpha/composite reliability, respectively. Patients (n = 301; mean age = 44.5 ± 15.2 years; 59.8% women) presenting with vestibular symptoms for at least 30 days who were diagnosed with a vestibular disorder and healthy participants (n = 43; mean age = 42 ± 17.9 years; 62.8% women) (N = 344). The DHI-CK and its three sub-scales-Physical, Emotional, Functional-exhibited good to excellent external reliability: ICCs in the test-retest were 0.93, 0.88, 0.91, and 0.92, respectively. Cronbach's alphas were 0.87, 0.71, 0.75, and 0.73, respectively. Convergent validity was supported by Spearman's correlations between the DHI-CK and the comparators. The receiver operating characteristic curve analysis confirmed discriminating validity. The DHI-CK was cross-culturally validated. It is a reliable and valid tool that can be used by clinicians and researchers to quantify vestibular disorder outcomes in Kurdish-speaking populations.