the Spearman correlation coefficients between the VAS scores and the overall THI score were: VAS-L, ρ = 0.67; VAS-A, ρ = 0.83; VAS-D, ρ = 0.78; and VAS-C, ρ = 0.52. Table 2 displays the results, including those of the 3 subscales of the THI questionnaire (functional, emotional and catastrophic). Objective: This study aims to assess the concordance between the visual analogue scale (VAS) and the digital rating scale (NRS) to measure the severity of LBP and to study their ability to predict disabilities. The time between the test and the vase balance test was 3 days. Choosing such a short test-repeat period was a matter of practicability, cost-effectiveness and safety of tinnitus stability. There are also promising results from reports on health devices used to measure test stability, where there was no difference in the results of the 2-day and 2-week test intervals [Marx et al., 2003]. The disadvantage of such a short time between the test and the repetition test for HRT assessment is that people probably remember their answers from the first test and tend to give the same answers again. CCI results with values > 0.70 indicate high reliability for vas-L, VAS-A and VAS-D. The CCI of the VAS-C result (i.e. 0.67) was close to high reliability. The study included patients who received informed oral consent. In our study design, we renounced informed written consent in order to reduce the amount of personal data stored. The patient`s information was anonymized immediately after registration.
The admission procedure was defined in consultation with the hospital`s data protection officer and the Regional Ethics Council of Western Norway. There was a convergent validity between the vas scales and the THI questionnaire, and THS (Subscale A) received a positive evaluation based on the criteria of Terwee et al.  because 75% of the results were consistent with the hypothesis chosen. Our results are comparable to those of other studies. Fiqueiredo et al.  found significant Spearman correlations between a VAS scale that measures tinnitus volume/disturbance and THI (r = 0.564, p < 0.001, n = 43). Adamchic et al. . .