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Chronobiology International
The Journal of Biological and Medical Rhythm Research
Volume 34, 2017 - Issue 6
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Original Articles

Sleep quality, chronotype, temperament and bipolar features as predictors of depressive symptoms among medical students

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Pages 708-720 | Received 03 Dec 2016, Accepted 04 Apr 2017, Published online: 10 May 2017
 

ABSTRACT

The assessment of risk factors is a crucial step in the prevention and treatment of affective disorders and should encompass personal dispositions. The aim of this study was to assess the value of chronotype and temperament as independent predictors of depressive symptoms among medical students. The study surveyed 140 students of the Faculty of Medicine with a battery of questionnaires: the Beck Depression Index (BDI), Hypomania Checklist 32 (HCL-32), Pittsburgh Sleep Quality Index (PSQI), Chronotype Questionnaire and Eysenck Personality Questionnaire Revised. The results were tested using Pearson’s correlation quotient and general linear model. Ten percent of the participants demonstrated a BDI score suggestive of clinically significant depressive symptoms. BDI score correlated positively with HCL-32 score. A rise in BDI was independently predicted by elevated Neuroticism and PSQI scores and morningness. Those effects were independent from each other and from other parameters of the model. The presence of depressive symptoms might be associated with bipolar features among medical students. Poor sleep quality predicted depressive symptoms, similarly to Neuroticism and independently of temperament and chronotype. Future studies on the associations between personal dispositions and mood disorders among medical students are required to help identify those at greater risk of developing affective illness. Effective prophylaxis and early intervention are warranted to ensure better treatment results.

Declaration of interest

The authors declare that they have no conflict of interest.

Funding

The study was founded by Medical University of Lodz institutional grant nr 503/1-151-07/503-16-001.

Additional information

Funding

The study was founded by Medical University of Lodz institutional grant nr 503/1-151-07/503-16-001.

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