Thai-version Migraine Disability Assessment (MIDAS) questionnaire: concurrent validity, test-retest reliability, internal consistency, and factors predictive for migraine-related disability.

The Thai-version MIDAS Questionnaire has moderate concurrent validity, acceptable internal consistency, and excellent test-retest reliability. It would be helpful to assess clinical outcomes. Future study with a standardized translation process for the Thai-version questionnaire and a larger sample size is warranted to confirm internal consistency and determine all probable predictive factors for migraine-related disability.