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Table 2 Test-retest reliability and ceiling/floor effects of the VISA-PC

From: The adaptation of sport assessment-patella questionnaire into simplified Chinese version: cross-cultural adaptation, reliability and validity

  1st-Test (mean ± SD) 2nd-Test (mean ± SD) ICC (95%CI) Observed range Floor effect (%)a Ceiling effect (%)a
Healthy Group 95.84 ± 5.97 b 95.81 ± 5.74 0.994 (0.960–0.998) 78–100 0.00 9.09
At-risk Group 91.87 ± 9.03 b 91.68 ± 8.99 0.992 (0.982–0.999) 68–99 0.00 0.00
Pathological Group 62.49 ± 11.39 62.41 ± 11.12 0.999 (0.998–0.999) 44–88 0.00 0.00
Total 83.95 ± 17.06 83.83 ± 16.96 0.999 (0.998–0.999) 44–100 0.00 2.34
  1. The 1st-Test was conducted at the beginning of this research (112 patients), the 2nd-Test was conducted one week later to calculate the test-retest reliability (ICC) of the VISA-PC (112 patients)
  2. ICC intra-class correlation coefficient, 95% CI 95% confidence interval, VISA-PC Chinese version of Victorian Institute of Sport Assessment-Patellar Tendinosis questionnaire
  3. a Percentage of patients with the worst (floor effect) and the best (ceiling effect) condition
  4. b Significant difference compared to Pathological Group