Cross-Cultural Translation and Validation of the Thai Version of the Scale for the Assessment and Rating of Ataxia (SARA-TH)

Objective: To culturally adapt the original English Scale for the Assessment and Rating of Ataxia to Thai (SARA-TH) and to evaluate the reliability and validity of the SARA-TH in assessing ataxia in acute ischemic stroke or transient ischemic attack (TIA) patients, as assessed by three healthcare professionals. Methods: The SARA underwent translation and cross-cultural adaptation to Thai according to established guidelines. Reliability (e.g., internal consistency, intrarater reliability, interrater reliability) and validity (e.g., content validity, convergent validity) were assessed in a sample of 50 participants with ataxia after acute ischemic stroke or TIA. Spearman correlation analysis was used to examine the relationships between the SARA-TH and the Barthel Index (BI-TH), the National Institutes of Health Stroke Scale (NIHSS-TH), and the International Cooperative Ataxia Rating Scale (ICARS) to assess convergent validity. Interrater and intrarater reliability among experienced and novice neurologists, physiotherapists, and occupational therapists were assessed using weighted kappa. Results: The SARA-TH demonstrated good comprehension and exhibited no significant floor or ceiling effects. It showed excellent internal consistency (Cronbach's alpha >= 0.776). Significant correlations were found between the SARA-TH score and the BI-TH score (r(s)=-0.743 to -0.665), NIHSS-TH score (r(s)=0.404-0.513), and ICARS score (r(s)=0.859-0.917). The intrarater reliability for each rater ranged from 0.724 to 1.000 (p<0.01), and the interrater reliability varied from 0.281 to 0.927 (p<0.01). Conclusion: The SARA-TH has excellent internal consistency, validity, and intrarater reliability, as well as acceptable interrater reliability among health professionals with varying levels of experience. It is recommended for assessing ataxia severity in individuals following acute ischemic stroke or TIA.