title: Effectiveness of educational poster on knowledge of emergency management of dental trauma--part 2: cluster randomised controlled trial for secondary school students.
abstract: OBJECTIVE
  To investigate the effectiveness of educational poster on improving secondary school students' knowledge of emergency management of dental trauma.
  
  
  METHODS
  A cluster randomised controlled trial was conducted. 16 schools with total 671 secondary students who can read Chinese or English were randomised into intervention (poster, 8 schools, 364 students) and control groups (8 schools, 305 students) at the school level. Baseline knowledge of dental trauma was obtained by a questionnaire. Poster containing information of dental trauma management was displayed in a classroom for 2 weeks in each school in the intervention group whereas in the control group there was no display of such posters. Students of both groups completed the same questionnaire after 2 weeks.
  
  
  RESULTS
  Two-week display of posters improved the knowledge score by 1.25 (p-value = 0.0407) on average.
  
  
  CONCLUSIONS
  Educational poster on dental trauma management significantly improved the level of knowledge of secondary school students in Hong Kong.
  
  
  BACKGROUND
  HKClinicalTrial.com HKCTR-1343 ClinicalTrials.gov NCT01809457.
authors.affiliation: Private Practice, Hong Kong.
authors.forename: Cecilia
authors.initials: C
authors.lastname: Young
authors.affiliation: Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America.
authors.forename: Kin Yau
authors.initials: KY
authors.lastname: Wong
authors.affiliation: The University of Hong Kong, Hong Kong.
authors.forename: Lim K
authors.initials: LK
authors.lastname: Cheung
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003729:Dental Care / Q000379:methods*; D004630:Emergencies; D005260:Female; D006266:Health Education / Q000379:methods*; D006801:Humans; D033181:Information Dissemination / Q000379:methods; D019359:Knowledge; D008297:Male; D057175:Posters as Topic; D015397:Program Evaluation; D012574:Schools; D013334:Students; D018677:Tooth Injuries / Q000628:therapy*; D055815:Young Adult
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