other studies, even though it was found to be higher than in the national survey (11.5% versus 8.8% in the national survey),2 which may be due to the poor validity of the Thai MINI instrument with regard to diagnosis of dysthymia (Cohen’s kappa only 0.2).23 In terms of future research, another instrument, such as the Structured Clinical Interview for DSM-IV Axis I Disorders dysthymia module, may be added to the MINI to ensure a better dysthymia diagnosis.