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

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

	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

^a Percentage of patients with the worst (floor effect) and the best (ceiling effect) score
^b The MDC value at an individual level;
^c The MDC value at the group level
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

ISSN: 1471-2474