Skip to main content

Table 3 The floor/ceiling effects, test-retest reliability, measurement error and responsiveness of SC-IdFAI

From: Adaptation and psychometric evaluation of the simplified Chinese version of the identification of functional ankle instability questionnaire in Chinese-speaking patients with chronic ankle instability disorders

  Floor effect a Ceiling effect a ICC (CI range) SEM MDC (I) b MDC (G) c ES SRM
Overall scale 0% 1.52% 0.936
(0.909–0.955)
1.346 3.73 0.32 −1.123 −1.554
Factor 1 0% 2.27% 0.907
(0.869–0.935)
0.886 2.46 0.21 − 0.531 − 0.683
Factor 2 0% 1.52% 0.881
(0.833–0.916)
0.668 1.85 0.16 −1.221 −1.347
Factor 3 0% 2.27% 0.876
(0.827–0.912)
0.466 1.29 0.11 −1.472 −1.100
  1. a Percentage of patients with the worst (floor effect) and the best (ceiling effect) score
  2. b The MDC value at an individual level;
  3. c The MDC value at the group level
  4. SC-IdFAI Simplified Chinese version of the Identification of Functional Ankle Instability questionnaire; ICC Intraclass correlation coefficient; CI Confidence interval; SEM Standard error of measurement; MDC Minimal detectable change; ES Effect size; SRM Standardized response mean