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Chronotype in individuals with schizophrenia: A meta-analysis
Magdalena Linke1, Konrad S Jankowski1
1Faculty of Psychology University of Warsaw, Warsaw, Poland.
Schizophrenia Research
|July 31, 2021
Summary
Individuals with schizophrenia exhibit a greater evening chronotype compared to healthy individuals. This finding suggests that eveningness may be a general risk factor for mental health conditions, not solely mood disorders.
Area of Science:
- Chronobiology
- Psychiatry
- Mental Health Research
Background:
- Evening chronotype is increasingly linked to mental health issues, particularly mood disorders.
- Limited research has explored the association between evening chronotype and schizophrenia.
Purpose of the Study:
- To determine if individuals with schizophrenia display a greater evening chronotype compared to healthy controls.
- To compare the eveningness of individuals with schizophrenia to those diagnosed with bipolar I disorder.
Main Methods:
- A systematic literature search was conducted across Medline/Pubmed, Google Scholar, and EBSCO databases up to April 2021.
- Two meta-analyses were performed: schizophrenia vs. healthy controls, and schizophrenia vs. bipolar I disorder.
- Meta-regression analysis was employed to control for potential confounding factors.
Main Results:
- Five studies involving 386 individuals with schizophrenia, 320 with bipolar I disorder, and 638 healthy controls were analyzed.
- Individuals with schizophrenia showed a moderately higher eveningness compared to healthy controls.
- No significant difference in eveningness was observed between individuals with schizophrenia and those with bipolar I disorder.
Conclusions:
- Schizophrenia is associated with a more pronounced evening chronotype, similar to that observed in bipolar I disorder.
- Evening chronotype may serve as a general marker or risk factor for a broader range of mental health problems.
- These findings highlight the potential role of circadian rhythm disruptions in the pathophysiology of schizophrenia.
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