title: The effect of optimism on depression: the mediating and moderating role of insomnia.
abstract: This article aims to clarify if insomnia exerts a mediating or moderating effect on the optimism-depression association in Chinese college students. 529 Chinese college students completed the Beck Depression Inventory (BDI-II), the Pittsburgh Sleep Quality Index (PSQI), the Revised Life Orientation Test (LOT-R) and the Multidimensional Scale of Social Support (MSPSS). The results failed to show any moderating effect but after adjustment for age, gender and social support, a mediating effect was observed. In conclusion, insomnia qualifies as a mediator, suggesting considerable variance in depressive symptoms of college students could be due to change in their sleep status.
authors.affiliation: City University of Hong Kong, Hong Kong.
authors.lastname: Cheuk Yan Sing
authors.forename: Wing S
authors.initials: WS
authors.lastname: Wong
mesh_terms: D003863:Depression / Q000175:diagnosis / Q000523:psychology*; D005260:Female; D006723:Hong Kong; D006801:Humans; D008297:Male; D055500:Resilience, Psychological; D007319:Sleep Initiation and Maintenance Disorders / Q000503:physiopathology / Q000523:psychology*; D011795:Surveys and Questionnaires; D055815:Young Adult