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Chronotype distribution in bipolar I disorder and schizophrenia in a Korean sample
Author(s) -
Ahn Yong Min,
Chang Jaeseung,
Joo Yeon Ho,
Kim Seong Chan,
Lee Kyu Young,
Kim Yong Sik
Publication year - 2008
Publication title -
bipolar disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.285
H-Index - 129
eISSN - 1399-5618
pISSN - 1398-5647
DOI - 10.1111/j.1399-5618.2007.00573.x
Subject(s) - chronotype , schizophrenia (object oriented programming) , bipolar disorder , circadian rhythm , psychology , clinical psychology , psychiatry , medicine , mood
Objectives: Although a broad range of circadian rhythm variations have been reported, analyses of chronotypes in bipolar I disorder (BDI) and schizophrenia are rare. The present study aimed to investigate specific chronotype patterns in BDI and schizophrenia compared with healthy subjects. Methods: All patients were clinically stable and recruited from the outpatient clinics of Seoul National University Hospital. They were diagnosed according to DSM‐IV criteria. ‘Morningness/eveningness’, a chronotype correlated with circadian phase, was evaluated using the Composite Scale of Morningness (CSM) among 92 patients with BDI, 113 patients with schizophrenia (SZ), and 95 control individuals. Results: The CSM scores were significantly correlated with age in the control group, but a significant correlation with age was not observed in the schizophrenia or BDI groups. After controlling for age, there were significant differences between the BDI and control groups. The SZ patients did not differ from the BDI or control groups. Conclusions: In this Korean sample, patients with BDI showed a significantly greater preference for ‘eveningness’ (including delayed sleep timing) than control individuals. The influences of pharmacotherapy or clinical status on CSM scores need to be clarified.