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Table 4 Construct validity of the 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

Correlation coefficient
rs (P value) a
C-IdFAI subscales
Overall Scale Factor 1 Factor 2 Factor 3 Hypotheses
FAAM
 ADL − 0.776 (< 0.001) b − 0.668 (< 0.001) b − 0.575 (< 0.001) b − 0.738 (< 0.001) b ≥ Moderate, and better than SF-36 wih SC-IdFAI
 Sport − 0.775 (< 0.001) b − 0.644 (< 0.001) b − 0.636 (< 0.001) b − 0.669 (< 0.001) b
SF-36
 Physical Function − 0.412 (< 0.001) b − 0.395 (< 0.001) c − 0.295 (0.001) c − 0.344 (< 0.001) c ≥ Moderate, and worse than FAAM wih SC-IdFAI
 Role-Physical −0.551 (< 0.001) b − 0.511 (< 0.001) b − 0.405 (< 0.001) b − 0.424 (< 0.001) b
 Bodily Pain − 0.482 (< 0.001) b − 0.441 (< 0.001) b − 0.359 (< 0.001) c − 0.422 (< 0.001) b
 General Health −0.549 (< 0.001) b − 0.529 (< 0.001) b − 0.323 (< 0.001) c −0.511 (< 0.001) b
 Vitality −0.372 (< 0.001) b − 0.404 (< 0.001) c − 0.155 (0.075) b −0.278 (0.001) b ≤ Poor, and worse than physical subscales of SF-36 and SC-IdFAI
 Social Function −0.242 (0.005) b −0.173 (0.047) b − 0.230 (0.008) b −0.107 (0.223) b
 Role-Emotional 0.035 (0.694) b 0.066 (0.455) b −0.048 (0.586) b 0.050 (0.568) b
 Mental Health −0.137 (0.119) b −0.116 (0.186) b − 0.083 (0.345) b −0.141 (0.108) b
  1. a Calculated by the Spearman’s correlation coefficient (rs) of the overall scale and subscales of the SC-IdFAI with FAAM and SF-36
  2. b Consistent with the Hypothesis
  3. c Inconsistent with the Hypothesis
  4. SC-IdFAI Simplified Chinese version of the Identification of Functional Ankle Instability questionnaire; FAAM Foot and ankle ability measure; ADL Activity of daily living; SF-36 Short-Form 36