-The English language Mood Disorder Questionnaire (MDQ) was translated into Thai.
-The process involved back-translation, cross-cultural adaptation, eld testing of the pre final version, as well as final adjustments.
-Two hundred and fifty major depressive disorder outpa- tients were further assessed by the Thai version of the MDQ and the Thai version of the Mini International Neuropsychiatric Interview (MINI).
-During the assessment, reliability and validity analyses, and receiver operating characteristic curve (ROC) analysis were performed.