title: Low physical activity and high screen time can increase the risks of mental health problems and poor sleep quality among Chinese college students.
abstract: OBJECTIVE
  To test the independent and interactive associations of physical activity (PA) and screen time (ST) with self-reported mental health and sleep quality among Chinese college students.
  
  
  METHODS
  Data were collected in October, 2013. The gender, age, residential background, body mass index (BMI), perceived family economy and perceived study burden were obtained from a total of 4747 college students (41.6% males and 58.4% females). The outcomes were self-reported PA status, ST, anxiety, depression, psychopathological symptoms and sleep quality. Analyses were conducted with logistic regression models.
  
  
  RESULTS
  Overall, 16.3%, 15.9% and 17.3% of the students had psychological problems, such as anxiety, depression and psychopathological symptoms, respectively. The prevalence of poor sleep quality was 9.8%. High ST was significantly positively associated with anxiety (OR=1.38, 95%CI: 1.15-1.65), depression (OR=1.76, 95%CI: 1.47-2.09), psychopathological symptoms (OR=1.69, 95%CI: 1.43-2.01) and poor sleep quality (OR=1.32, 95%CI: 1.06-1.65). High PA was insignificantly negatively associated with anxiety, depression, psychopathological symptoms and poor sleep. Low PA and high ST were independently and interactively associated with increased risks of mental health problems and poor sleep quality (p<0.05 for all).
  
  
  CONCLUSIONS
  Interventions are needed to reduce ST and increase PA in the lifestyles of young people. Future research should develop and measure the impacts of interventions and their potential consequences on sleep, health, and well being.
authors.affiliation: Department of Maternal, Child & Adolescent Health, School of Public Health, Anhui Medical University, Hefei, China; Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Wu
authors.affiliation: Department of Maternal, Child & Adolescent Health, School of Public Health, Anhui Medical University, Hefei, China.
authors.forename: Shuman
authors.initials: S
authors.lastname: Tao
authors.affiliation: Department of Maternal, Child & Adolescent Health, School of Public Health, Anhui Medical University, Hefei, China.
authors.forename: Yukun
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Maternal, Child & Adolescent Health, School of Public Health, Anhui Medical University, Hefei, China; Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, China.
authors.forename: Shichen
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Department of Maternal, Child & Adolescent Health, School of Public Health, Anhui Medical University, Hefei, China; Anhui Provincial Key Laboratory of Population Health & Aristogenics, Hefei, China.
authors.forename: Fangbiao
authors.initials: F
authors.lastname: Tao
mesh_terms: D000328:Adult; D001007:Anxiety / Q000453:epidemiology* / Q000209:etiology; D001292:Attitude to Computers; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D003863:Depression / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity; D057185:Sedentary Behavior; D057566:Self Report; D012893:Sleep Wake Disorders / Q000453:epidemiology* / Q000209:etiology; D013334:Students / Q000523:psychology / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires; D014495:Universities; D055815:Young Adult