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This study aimed to elucidate the validity and reliability of the Korean version of the Mood Disorder Questionnaire (K-MDQ), which is a screening instrument developed for bipolar disorders.

This study translated the MDQ into Korean to produce the K-MDQ. The K-MDQ was applied to 126 outpatients with bipolar disorder clinically diagnosed by Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition and 112 controls without a psychiatric history. The long-term test-retest reliability with a 10-month interval was investigated in 30 bipolar outpatients.

The internal consistency (Cronbach α) of the K-MDQ was .88. The correlations between each item and the total score ranged from 0.43 to 0.76 and were all statistically significant (P < .001). Factor analysis revealed 3 factors that explained 59.5% of the total variance. The mean total score was higher in patients (8.48) than …