title: Developmental trajectories of cigarette use and associations with multilayered risk factors among Chinese adolescents.
abstract: BACKGROUND
  We aimed to identify developmental trajectories of cigarette use and risk factors associated with the distinct developmental courses of smoking in Chinese early adolescents from age 12 to 16 years.
  
  
  METHODS
  Analysis was conducted with secondary data from a longitudinal, prospective cohort of 3,521 Chinese adolescents randomly selected from 4 rural and 7 urban middle schools in Wuhan, China. A group-based growth mixture modeling approach was adopted to identify developmental trajectories of cigarette use. Multilayered intrapersonal (e.g., attitudes toward smoking) and interpersonal (e.g., parental smoking and perceived parental disapproval of smoking) risk factors selected from an ecological perspective were prospectively linked to the identified patterns of smoking trajectory.
  
  
  RESULTS
  Three trajectory patterns were identified from the whole cohort: nonsmokers (48.7%), stable light/occasional smokers (48.6%), and accelerating smokers (2.7%). After adjustments for gender, urban residence, and family socioeconomic status, adolescents with higher levels of problems in parent-child relationships and family disharmony, higher perceived norms of peer smoking, higher proportion of good friend smoking, having more troubles with teachers, poorer academic performance, and reporting more frequent depressive symptoms were significantly more likely to be in the trajectory group of either stable light/occasional smokers or accelerating smokers than in the group of nonsmokers. The probability of being in the accelerating smoking trajectory group was positively and significantly related to parental smoking and lack of school bonding.
  
  
  CONCLUSIONS
  Study findings help to advance knowledge of the distinct developmental courses of smoking behavior and their associations with multilayered risk factors among Chinese early adolescents.
authors.affiliation: School of Community and Global Health, Claremont Graduate University, CA;
authors.forename: Bin
authors.initials: B
authors.lastname: Xie
authors.forename: Paula
authors.initials: P
authors.lastname: Palmer
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Cindy
authors.initials: C
authors.lastname: Lin
authors.forename: C Anderson
authors.initials: CA
authors.lastname: Johnson
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D002648:Child; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D010287:Parent-Child Relations; D010379:Peer Group; D012307:Risk Factors; D012907:Smoking / Q000453:epidemiology*