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Abstract Visual vertigo (VV) is one of the common symptoms among vestibular disorder. The Visual Vertigo Analogue Scale (VVAS) is a measurement that was used to assess intensity of visual vertigo containing nine conditions of visual stimuli that aggravate dizziness. This work was done to develop the Arabic version of VVAS and to assess its reliability and validity. The present study was conducted at audio-vestibular unit, otolaryngology department, and faculty of medicine - Menoufia University in the period from January 2018 to April 2019. We developed an Arabic language version of the VVAS by translation from English and modification to meet cultural acceptability. The study included 170 subjects; the control group included100 normal subjects (51 male, 49 female with age range 19- 63 years), while the cases (30 male, 40 female with age range 18- 65 years) were diagnosed as visual vertigo patients according to the modified visual vestibular mismatch questionnaire. The results of this study showed that the VV common in middle age patients (45.6±11.9 years), female (57% of the patients). There was statistically significant difference between the study and control groups regarding mean score of items of the Arabic VVAS (P value < 0.001) using the Wilcoxon-Mann Whitney test. The mean (± SD) total score of the Arabic VVAS in controls was 10.9±12.1 versus 35.5±16.8 for VV patients. The internal consistency was used to evaluate the degree to which different test items produce similar results. The results showed that the Arabic VVAS has good internal consistency indicating good reliability (Cronbach’s alpha =0.72 for controls and =0.83 for the VV patients). 60 Summary After one week, subgroup of participants who attended the follow-up visit was requested to fill the Arabic VVAS again. We found that there was a positive correlation between total sores of the Arabic VVAS in the first and second visit in the study and control groups, further demonstrating good repeatability of the Arabic VVAS ( r = 0.97, p value < 0.001). For controls, in the first visit the total score mean was 10.9 ± 12.1. In the second visit, the total score mean was 10.6 ± 11.9, Spearman’s correlation (r) = 0.976* for the total score. For visual vertigo patients, in the first visit the total score mean was 35.5 ± 16.8. In the second visit, the total score mean was 34.5 ± 17.1, Spearman’s correlation (r) = 0.978* for the total score. The receiver operating characteristic curve was performed to find the optimal cut-off point for the Arabic VVAS. Sensitivity, specificity, positive predictive value, negative predictive values, and accuracy were also calculated. The Arabic VVAS demonstrated the best psychometric properties for a cut off score of 17 with a sensitivity of 80%, specificity of 82%, area under the curve of 0.897, a positive predictive value was 76%, a negative predictive value of 85%, and accuracy was 81%. The results showed that the Arabic VVAS is a reliable and valid screening tool in diagnosing visually- induced dizziness among the Arabic community. |