Comparison of Psychometric Properties of the Original and Brief Version of the Tampa Scale for Kinesiophobia

Introduction: Some accurate tools exist to assess fear-avoidance behavior, such as the Tampa scale for kinesiophobia (TSK) in individuals with musculoskeletal problems. The current research aims to compare the psychometric characteristics of the original Persian 17-items TSK questionnaire and its 11-item brief version in chronic non-specific low-back pain (CNSLBP). Materials and Methods: In this test development study, 295 patients with CNSLBP referred to the physiotherapy clinic of Milad Hospital in Tehran city, Iran were evaluated. Confirmatory factor analysis (CFA) and α Cronbach was conducted to assess the validity and reliability of the original and brief Persian version of the TSK, respectively. For goodness-of-fit, the Χ2/df, root mean square error of approximation (RMSEA), goodness-of-fit index (GFI), and comparative fit index (CFI) indices were used. Results: Internal consistency specified by Cronbach’s α was 0.949 for the original version of the questionnaire and 0.927 for the brief one. Based on the CFA findings, the goodness-of-fit indices for the brief version were GFI=0.921, RMSEA=0.078 (90% confidence interval (CI), 0.062%-0.094%), comparative fit index (CFI)=0.981, and Χ2/df=2.791. These indices for the original one were 0.882, 0.066 (90% CI, 0.055%-0.076%), 0.983, and 2.270, respectively.    A significant correlation was found between these two versions (P<0.001). These findings confirm the adequacy of the brief version of the TSK. Conclusion: The brief Persian version of TSK can be considered a reliable and valid tool to evaluate somatic focus and activity avoidance in patients with CNSLBP.