title: Trend analysis of cigarette smoking by Indiana adolescents, 1991-2000.
abstract: OBJECTIVE
  To examine the feasibility of using a composite index of smoking behaviors to analyze adolescent smoking.
  
  
  METHODS
  A secondary analysis of data from 10 annual surveys (1991-2000), from 566,467 Indiana students in grades 6 through 12. A composite index was calculated, and differences between index scores were analyzed using 1-way ANOVA, Tukey's post hoc tests, and 2-way moving averages.
  
  
  RESULTS
  Index scores increased before 1997 and decreased after 1976, with greater change among 7th through 10th graders.
  
  
  CONCLUSIONS
  The 2-way moving average comparison of a composite index, used with prevalence-based trend analyses, provides a more complete picture of changes in adolescent cigarette smoking.
authors.affiliation: Idaho State University, USA.
authors.forename: Kele
authors.initials: K
authors.lastname: Ding
authors.forename: Mohammad R
authors.initials: MR
authors.lastname: Torabi
authors.forename: William J
authors.initials: WJ
authors.lastname: Bailey
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D000704:Analysis of Variance; D002648:Child; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007196:Indiana / Q000453:epidemiology; D008297:Male; D012907:Smoking / Q000453:epidemiology* / Q000639:trends*; D011795:Surveys and Questionnaires