biostudies-literatureUnknown4(7)Guo L<h4>Study objective</h4>To investigate the prevalence and the correlates of sleep disturbance and depressive symptoms among Chinese adolescents and to examine the association between the two problems.<h4>Design</h4>Cross-sectional survey.<h4>Participants</h4>A total of 3186 school students in grades 7-12 were sampled from the schools in Guangdong. A stratified-cluster random-sampling strategy was used to select the schools.<h4>Main outcome measures</h4>A self-administered questionnaire was used. The Pittsburgh Sleep Quality index (PSQI) was used to assess the occurrence of sleep disturbance, and the Center for Epidemiology Scale for Depression (CES-D) was used to identify whether individuals had depressive symptoms.<h4>Results</h4>The mean PSQI global score was 8.7 (±2.4) points, and 39.6%BMJ opene005517https://www.ebi.ac.uk/biostudies/studies/S-EPMC4120320biostudies-literaturePrevalence and correlates of sleep disturbance and depressive symptoms among Chinese adolescents: a cross-sectional survey study.PMC4120320Guo LHe YHuang JHuang GDeng JLu CGao XDeng XfalsePrevalence and correlates of sleep disturbance and depressive symptoms among Chinese adolescents: a cross-sectional survey study.<h4>Study objective</h4>To investigate the prevalence and the correlates of sleep disturbance and depressive symptoms among Chinese adolescents and to examine the association between the two problems.<h4>Design</h4>Cross-sectional survey.<h4>Participants</h4>A total of 3186 school students in grades 7-12 were sampled from the schools in Guangdong. A stratified-cluster random-sampling strategy was used to select the schools.<h4>Main outcome measures</h4>A self-administered questionnaire was used. The Pittsburgh Sleep Quality index (PSQI) was used to assess the occurrence of sleep disturbance, and the Center for Epidemiology Scale for Depression (CES-D) was used to identify whether individuals had depressive symptoms.<h4>Results</h4>The mean PSQI global score was 8.7 (±2.4) points, and 39.6%2014-01-01T00:00:00Z2014 Jul2025-04-26T08:26:31.387Z2019-03-27T01:33:19ZS-EPMC41203202507993710.1136/bmjopen-2014-005517