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Korean J Schizophr Res > Volume 18(1); 2015 > Article
Korean Journal of Schizophrenia Research 2015;18(1):28-34.
DOI: https://doi.org/10.16946/kjsr.2015.18.1.28    Published online April 30, 2015.
A Comparison of Magical Ideation in Nonclinical Adolescent and Adult Groups : An Item Response Theory Based Differential Item Functioning Analysis.
Jung Lee, Sumi Park, Yeni Kim, Yong Sik Kim, Hee Yeon Jung
1Department of Psychiatry, Seoul National University Hospital, Seoul, Korea.
2Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, Korea. hyjung@snu.ac.kr
3Department of Adolescent Psychiatry, National Center for Child and Adolescent Psychiatry, Seoul National Hospital, Seoul, Korea.
4Department of Psychiatry and Institute of Clinical Psychopharmacology, Dongguk University Ilsan Hospital, Goyang, Korea.
5Department of Psychiatry and Behavioral Science, Seoul National University College of Medicine, Seoul, Korea.
Abstract
OBJECTIVES
We examined magical ideation in adolescent and adult group by Magical Ideation Scale (MIS). We also explored how adolescents and adults respond differently to each items of MIS.
METHODS
310 nonclinical adults and 310 Year 10 students participated in this study, and completed MIS and Symptom Checklist 90-revision (SCL-90-R). Total scores of MIS were compared between adults and adolescents. The item characteristics of MIS were evaluated by item response theory (IRT). Differential item functioning (DIF) was detected using the parameters of IRT.
RESULTS
Total score of MIS was higher in adolescents than in adults, but there was no statistical significance. Item 5, 10, 13, and 16 showed significant difference on item difficulty parameters and were identified as DIF. Among DIF items, item 5 was more difficult for adolescents than adults. Item 10, 13, and 16 were more difficult for adults than adolescents. The modified MIS score excluding 4 DIF items was significantly higher in adolescents than adults.
CONCLUSION
The influence of age on response to DIF items should be considered when comparing MIS scores between adolescents and adults.
Key Words: Magical ideation scale · Age · Item response theory · Differential item functioning · Adolescent · Adult
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