Determination of the validity, reliability and responsiveness of the cognitive exercise therapy approach scale in patients with a diagnosis of knee osteoarthritis

This study was planned to investigate the validity, reliability and sensitivity of the Cognitive Exercise Therapy Approach (BETY) scale in individuals with knee osteoarthritis (OA). The study included 150 individuals who diagnosed knee osteoarthritis at stage 1 or 2 according to the Kellgren-Lawrence scale. For determining daily living activities; Health Assessment Questionnaire (HAQ), for quality of life Short Form-36 (SF-36) Quality of Life Scale, for anxiety and depression levels; Hospital Anxiety and Depression Scale (HADS), for severity of disease Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) and for biopsychosocial evaluation BETY Scale were used. The correlation between BETY Scale and other scales was examined by Spearman correlation analysis (r=-0.252, 0.633, p<0,05). Cronbach's alpha coefficient and item-total correlation were used as reliability methods. Cronbach's alpha coefficient was examined for the internal consistency of the scale and was found to be 0.887 for the first evaluation, 0.917 for measurements after 1 week and 0.843 for measurements after 3 months. Item total correlation, which was another indicator of reliability, ranged from 0.632 to 0.854 (p<0.05). For investigating responsiveness of BETY scale; Wilcoxon Signed Ranks Test was used to examine the change in the results of the scales, which are most frequently used scales in knee OA, completed after 3 months with the first measurement of the BETY scale. As a result of our study, it was concluded that BETY scale was valid, reliable and responsible in individuals with knee OA diagnosis. This result showed that BETY scale can be used in clinics to evaluate biopsychosocial involvement and treatment effect in individuals with OA.