Lacking an instrument that monitors behavior problems in developmentally delayed patients in Thailand, this study's purpose was to create a cross-cultural translation of the Aberrant Behavior Checklist-Community (ABC-C) into the Thai language. After forward and back-translation, the prefinal version ABC-C Thai version was tested and evaluated by ten healthcare officers. The final version was used to calculate the reliability and validity with 40, 2-18 year-old developmentally delayed patients

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... two raters. The results indicated that the ABC-C Thai version has high internal consistency (α=0.922), high inter-rater and test-retest reliability [ICC=0.90 (95% CI: 0.81-0.95) and ICC=0.92 (95% CI: 0.86-0.96) respectively. It also has a high positive correlation with The Clinical Global Impression-Severity Scale (CGI-S), (r=0.87; p˂0.01) with evaluation of concurrent validity. The ABC-C Thai version has good psychometric properties and can be used to evaluate and monitor behavior problems of developmentally delayed patients in the clinical and research fields. Volume 6 • Issue 2 • 1000373 4. Aman MG, Singh NN, Stewart AW, Field CJ (1985) The aberrant behavior checklist: a behavior rating scale for the assessment of treatment effects. Am J Ment Defic 89: 485-491.