title: Substance use, sexual behaviours, and suicidal ideation and attempts among adolescents: findings from the 2004 Guangzhou Youth Risk Behaviour Survey.
abstract: OBJECTIVE
  To investigate the prevalence of substance use, sexual behaviours, and suicidal ideation and attempts among adolescents in Guangzhou, China, and to explore the associations between these risk behaviours and demographics.
  
  
  METHODS
  A two-stage stratified cluster sample design produced a representative sample of 12-19-year-old students in Grades 1-6 who attended public middle schools in Guangzhou.
  
  
  METHODS
  Prevalence estimates and 95% confidence intervals were calculated using SUDDAN statistical software. Logistic regression was used to examine the associations between health risk behaviours and demographics.
  
  
  RESULTS
  In total, 5988 students (45.5% males, 54.5% females) were included in this study. Overall, 17.6% of students had tried cigarette smoking, 63.1% of students had had at least one drink of alcohol, 1.7% of students had used marijuana, 3.5% of students had experienced sexual intercourse, 17.6% of students had seriously considered attempting suicide and 3.2% had attempted suicide. Male gender was positively associated with substance use and sexual risk behaviours, but negatively associated with feeling sad or hopeless and suicide ideation. Being in Grades 4-6 was positively associated with lifetime cigarette use, lifetime alcohol use, current alcohol use, episodic heavy drinking and marijuana use, but negatively associated with suicide attempts. Higher parental education was positively associated with lifetime alcohol use, current alcohol use, lifetime marijuana use, feeling sad or hopeless, and suicidal ideation, but negatively associated with lifetime cigarette use and current cigarette use.
  
  
  CONCLUSIONS
  Gender, school grade and parental education were found to be significantly associated with certain risk behaviours.
authors.affiliation: Department of Preventive Medicine, Guangzhou Medical College, China.
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: X-J
authors.initials: XJ
authors.lastname: Deng
authors.forename: J-J
authors.initials: JJ
authors.lastname: Wang
authors.forename: X-W
authors.initials: XW
authors.lastname: Wang
authors.forename: L
authors.initials: L
authors.lastname: Xu
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D002648:Child; D002681:China / Q000453:epidemiology; D016000:Cluster Analysis; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D015995:Prevalence; D012307:Risk Factors; D012725:Sexual Behavior / Q000706:statistics & numerical data*; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000523:psychology; D013406:Suicide, Attempted / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires