Validity and Reliability of Thai Version of Missouri Assessment of Genetics Interview for Children [Th-MAGIC] for Diagnosis of Substance Use Disorder in Children Aged 13 to 17 Years
Varoth Chotpitayasunondh MD1, Woraphat Ratta-apha MD, PhD2 Nantawat Sitdhiraksa MD, PhD2, Wanlop Atsariyasing MD2, Chanvit Pornnoppadol MD2
Affiliation : 1 Department of Mental Health, Ministry of Public Health, Bangkok, Thailand 2 Department of Psychiatry, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
Objective : The present study aims to examine the validity and reliability of the Thai version of the Missouri Assessment of
Genetics Interview for Children [Th-MAGIC] for diagnosis of substance use disorder (alcohol use and abuse/dependence
and street drugs sections) in children aged 13 to 17 years.
Materials and Methods: The English version of the MAGIC for diagnosing substance use disorder in adolescent was
translated into the Thai language and back-translated. The Th-MAGIC’s content validity was tested. Thirty participants
diagnosed with substance use disorders by the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text
Revision and 30 controls participants were interviewed with Th-MAGIC by a trained interviewer. Afterwards, the concurrent
validity and inter-rater reliability were analyzed.
Results : To test the internal consistency, Cronbach’s alpha coefficient for the alcohol-use section and the street drugs section
were 0.93 and 0.55, respectively. The sensitivity and specificity of alcohol use section were 86.7% and 100%, respectively.
The sensitivity and specificity of street drugs section were 96.7% and 100%, respectively. The kappa coefficient of inter-
rater reliability of alcohol use section was 0.93 and of the street drugs section was 0.94.
Conclusion : The Th-MAGIC for diagnosis of substance use disorder in children age 13 to 17 has a good content and
concurrent validity and inter-rater reliability. The results indicated that the Th-MAGIC can be used as a semi-structured
interview for identifying substance use problems in adolescence.
Keywords : Validity, Reliability, Th-MAGIC, Substance use disorder
