Abstract
Purpose
The alterations of the Subjective visual vertical test are related to vestibular pathology. Our previously validated method to distinguish between healthy and pathological individuals measures the deviation from the Subjective visual vertical using a mobile application installed on a smartphone fixed to a turntable anchored to the wall. The aim of this study was evaluating the intra-observer reliability of our method in individuals with or without vestibular pathology.
Methods
Participants were recruited consecutively. In each individual two measurements with an interval of 2 h were made. Both tests were performed by the same examiner. A total of 91 patients were included in this study, of which 25 were healthy and 66 diseased. Intra-observer reliability was evaluated using the intraclass correlation coefficient (ICC). To assess the clinical accuracy of the measurement, we calculated the standard error of the measurement (SEM) and the minimum detectable change (MDC) with a 95% confidence interval.
Results
Intra-observer reliability was excellent with an ICC 0.95 (0.92–0.97) in the whole sample, in healthy patients 0.91 (0.80–0.96) and in pathological patients 0.92 (0.87–0.95). The SEM was calculated to be 0.59 for the whole sample (0.26 in the “healthy” group, and 0.67 in the pathological group). Likewise, the sample’s MDC was 1.16, being 0.52 and 1.36 for the healthy and the pathological group, respectively.
Conclusions
Considering the results, our method presents an excellent intraobserver reliability. Furthermore, changes in deviation greater than 0.52 in healthy individuals and 1.36 in pathological individuals can be considered a real change in deviation.
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Riera-Tur, L., Antúnez-Estudillo, E., Montesinos-González, J.M. et al. Test–retest of the Subjective Visual Vertical Test performed using a mobile application with the smartphone anchored to a turntable. Eur Arch Otorhinolaryngol 280, 613–621 (2023). https://doi.org/10.1007/s00405-022-07512-6
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DOI: https://doi.org/10.1007/s00405-022-07512-6