Analysis of the measurement properties of the Brazilian-Portuguese version of the Tampa Scale for Kinesiophobia-11 in patients with fibromyalgia.

Abstract Objective To analyze the measurement properties of the Brazilian-Portuguese version of the Tampa Scale for Kinesiophobia-11 (TSK-11) in patients with fibromyalgia. Methods Assessment was made at three time points: baseline (n = 130) and 15 days (n = 54) and eight weeks after baseline (n = 51). Data collected at baseline were used to assess internal consistency, criterion and construct validity, and ceiling and floor effects. Data collected at baseline and 15 days after baseline were used to assess reliability and measurement error, and data collected before and after an eight-week exercise-based physical therapy intervention were used to assess interpretability of change scores. Results The TSK-11 showed adequate internal consistency (Cronbach's alpha = 0.77; alpha if item deleted: 0.74–0.77), substantial reliability (intraclass correlation coefficient2,1 = 0.85; 95% confidence interval: 0.75, 0.90), good measurement error (standard error of measurement: 2.65 points), and a minimal detectable change (90% confidence) of 6.16 points. For validity, the TSK-11 showed a positive and good correlation with the original TSK (r = 0.84, p  Conclusion The TSK-11 is consistent, reliable, and appropriate to assess fear of movement in patients with fibromyalgia in the clinical context. Responsiveness of the TSK-11 should be tested in future studies.