Open Access, Peer-reviewed

ISSN 2005-7571 (Online)
Volume 28, Number 2 (2/2021)
Original Article <page. 70-7 >
DOI : 10.22857/kjbp.2021.28.2.005

Clinical Characteristics of Formal Thought Disorder in Schizophrenia

Chaeyoung Yang, MD1,2;Han-sung Kim, MD3;Eunkyung Kim, PhD4;Il Bin Kim, MD4;Seon-Cheol Park, MD1,4; and Joonho Choi, MD1,4;

1;Department of Psychiatry, Hanyang University College of Medicine, Seoul, 2;Department of Psychiatry, Hanyang University Medical Center, Seoul, 3;Department of Psychiatry, Yong-In Mental Hospital, Yongin, 4;Department of Psychiatry, Hanyang University Guri Hospital, Guri, Korea

Objectives : Our study aimed to present the distinctive correlates of formal thought disorder in patients with schizophrenia, using the Clinical Language Disorder Rating Scale (CLANG).

Methods : We compared clinical characteristics between schizophrenia patients with (n = 84) and without (n = 82) formal thought disorder. Psychometric scales including the CLANG, the Brief Psychiatric Rating Scale (BPRS), the Young Mania Rating Scale (YMRS), the Calgery Depression Scale for Schizophrenia (CDSS) and the Word Fluency Test (WFT) were used.

Results : After adjusting the effects of age, sex and total scores on the BPRS, YMRS and WFT, the subjects with disorganized speech presented significantly higher score on the abnormal syntax (p = 0.009), lack of semantic association (p = 0.005), discourse failure (p < 0.0001), pragmatics disorder (p = 0.001), dysarthria (p < 0.0001), and paraphasic error (p = 0.005) items than those without formal thought disorder. With defining the mentioned item scores as covariates, binary logistic regression model predicted that discourse failure (adjusted odds ratio [aOR] = 5.88, p < 0.0001) and pragmatics disorder (aOR = 2.17, p = 0.04) were distinctive correlates of formal thought disorder in patients with schizophrenia.

Conclusions : This study conducted Clinician Rated Dimensions of Psychosis Symptom Severity (CRDPSS) and CLANG scales on 166 hospitalized schizophrenia patients to explore the sub-items of the CLANG scale independently related to formal thought disorders in schizophrenia patients. Discourse failure and pragmatics disorder might be used as the distinctive indexes for formal thought disorder in patients with schizophrenia.

Key words : Clinical Language Disorder Rating Scale;Discourse failure;Formal thought disorder;Pragmatics disorder;Schizophrenia.


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