title: Sleep quality of Chinese adolescents: distribution and its associated factors.
abstract: OBJECTIVE
  To investigate the sleep quality status and its associated factors (including psychological and physiological as well as social demographic factors) among Chinese mainland adolescents.
  
  
  METHODS
  Ten schools, including junior schools, senior schools and universities of Hefei (the capital of Anhui Province in China), were randomly selected. By using the Pittsburgh Sleep Quality Index, Self-Rated Health Measurement Scale Version 1.0, University of California, Los Angeles, Loneliness Scale, Beck Depression Inventory, Self-rating Anxiety Scale and a demographic survey, a cross-sectional study was implemented to 5226 students of the selected schools to investigate the adolescents' sleep quality, self-rated health, psychological status and demographic variables.
  
  
  RESULTS
  There were significant sleep quality differences between different groups of grade level, residence, family type, self-report personality, self-report examination scores, self-rated health, depression, loneliness and anxiety according to the results of the univariate analysis (P < 0.01 or <0.05). The multivariate analysis indicated that high grade level (OR = 1.490, 95%CI = 1.350-1.645), living in rural areas (OR = 0.874, 95%CI = 0.799-0.956), poor self-rated health (OR = 0.934, 95%CI = 0.926-0.942), high degree of depression (OR = 1.867, 95%CI = 1.514-2.302) and anxiety (OR = 1.976, 95%CI = 1.647-2.372) may be the influencing factors of poor sleep.
  
  
  CONCLUSIONS
  The poor sleep quality of many adolescents may be attributed to various causes, especially psychological reasons.
authors.affiliation: Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University, Hefei, Anhui Province, China.
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Xu
authors.forename: Hong
authors.initials: H
authors.lastname: Su
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Zou
authors.forename: Juan
authors.initials: J
authors.lastname: Chen
authors.forename: Jialing
authors.initials: J
authors.lastname: Wu
authors.forename: Weiwei
authors.initials: W
authors.lastname: Chang
mesh_terms: D000293:Adolescent; D001007:Anxiety / Q000150:complications; D002648:Child; D002681:China; D003863:Depression / Q000150:complications; D005260:Female; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D011569:Psychiatric Status Rating Scales; D012307:Risk Factors; D012890:Sleep / Q000502:physiology*; D012893:Sleep Wake Disorders / Q000453:epidemiology / Q000503:physiopathology / Q000523:psychology*; D011795:Surveys and Questionnaires; D055815:Young Adult