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In order to examine the relationships of smartphone use, sleep quality, chronotype, and physical exercise, with a depressive state, the authors administered a self-reporting questionnaire survey, which included the Japanese version of the Smartphone Dependence Scale (J-SDS), the Pittsburg Sleep Quality Index (PSQI), the Morningness-Eveningness Questionnaire (MEQ), and the Beck Depression Inventory (BDI), to 119 university students in Japan. Results of multivariate logistic regression analysis indicated that scores for the J-SDS and PSQI were significantly related to BDI score. These findings suggest that smartphone addiction and poor sleep quality are associated with the depressive state in students in Japan.<\/jats:p>","DOI":"10.4018\/ijcbpl.2019100102","type":"journal-article","created":{"date-parts":[[2019,11,7]],"date-time":"2019-11-07T12:27:37Z","timestamp":1573129657000},"page":"22-31","source":"Crossref","is-referenced-by-count":5,"title":["Smartphone Addiction and Sleep Quality Associated with Depression in University Students in Japan"],"prefix":"10.4018","volume":"9","author":[{"given":"Satoko","family":"Ezoe","sequence":"first","affiliation":[{"name":"Health Service Center Izumo, Shimane University, Shimane, Japan"}]},{"given":"Tadayuki","family":"Iida","sequence":"additional","affiliation":[{"name":"Prefectural University of Hiroshima, Hiroshima, Japan"}]},{"given":"Ken","family":"Inoue","sequence":"additional","affiliation":[{"name":"Kochi University, Kochi, Japan"}]},{"given":"Masahiro","family":"Toda","sequence":"additional","affiliation":[{"name":"Graduate School of Human Life Sciences, Notre Dame Seishin University, Okayama, Japan & Department of Public Health, Wakayama Medical University, Wakayama, Japan"}]}],"member":"2432","reference":[{"key":"IJCBPL.2019100102-0","doi-asserted-by":"publisher","DOI":"10.3109\/07420528.2012.719971"},{"key":"IJCBPL.2019100102-1","doi-asserted-by":"publisher","DOI":"10.1186\/s12888-018-1745-4"},{"key":"IJCBPL.2019100102-2","doi-asserted-by":"crossref","unstructured":"American Psychiatric Association. 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