Cross-cultural Adaptation of the Cumberland Ankle Instability Tool-Youth Thai version.

BACKGROUND This study aimed to translate the original version of the CAITY into a Thai version by using cross-cultural adaptation and to examine the psychometric properties and cut-off score of the CAITY Thai version (CAITY-T). METHODS Six steps of cross-cultural adaptation were used to translate and validate the psychometric properties in 267 participants (140 with CAI; 127 without CAI; mean age = 12.3 ± 2.42 years). Validation was carried out for internal consistency, concurrent validity against a visual analog scale for global perceived ankle instability, and discriminative validity (ROC curve). CAITY-T was completed twice by 133 volunteer children (49.62%) for test-retest reliability. The cut-off score was determined by means of Youden's index. RESULTS CAITY was successfully adapted for the Thai language. Validation showed good internal consistency (Cronbach's alpha = 0.767) and concurrent validity (Pearson correlation coefficient = 0.8 right ankle and 0.784 left ankle). The test-retest reliability was substantial with the ICC (2,1) of 0.865 (95% CI = 0.809 - 0.904). The ROC curve and Youden's index showed the cut-off score that discriminated between children with and without CAI on the CAITY-T at ≤ 25. CAITY-T obtained 95.2% sensitivity, 97% specificity, 0.05 negative, and 32 positive likelihood ratios. CONCLUSION CAITY-T was valid and available for Thai children aged 8-16 years. It displayed positive reliability, good validity and an acceptable cut-off score for the CAITY Thai version. The cut-off score for children had high sensitivity, specificity, and positive and negative likelihood ratios.