title: Effects of a Cancer Prevention Advertisement on Beliefs and Knowledge about Cancer Prevention.
abstract: BACKGROUND
  Outcome-expectation beliefs and knowledge may ultimately influence behavior for cancer prevention. The aims of this study were to measure changes in knowledge and beliefs about cancer prevention before and after viewing a television advertisement and identify the factors affecting receptivity to its messages.
  
  
  METHODS
  A one-group pretest-posttest design was used in this study of 1,000 individuals aged 20 to 65 years who were recruited online in November 2014. The outcome variables included cancer prevention beliefs based on the Health Belief Model (five items) and knowledge about risk factors for cancer (seven items).
  
  
  RESULTS
  Perceived susceptibility, perceived benefits, and self-efficacy increased significantly and their perceived severity and perceived barriers decreased significantly, after participants viewed the television advertisement. Correct responses to questions about risk factors also increased significantly, except for smoking. The main factors affecting changes in the outcome variables were age, interest in cancer prevention, social network, satisfaction with the ad, and pretest scores.
  
  
  CONCLUSIONS
  Television advertisements with positive frameworks can be an efficient channel of improving beliefs and knowledge about cancer prevention in a short period. The continuous development of intervention materials that consider the demographics, needs, and satisfaction of the target group will be necessary for future studies.
authors: Cancer Information and Education Branch, National Cancer Control Institute, National Cancer Center, Goyang-si, Republic of Korea E-mail : jkjun@ncc.re.kr.
authors: Su Yeon
authors: SY
authors: Kye
authors: Jisu
authors: J
authors: Yoo
authors: Min Hee
authors: MH
authors: Lee
authors: Jae Kwan
authors: JK
authors: Jun
mesh_terms: D000328:Adult; D000329:Advertising / Q000592:standards*; D000368:Aged; D003469:Culture; D005260:Female; D015438:Health Behavior; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000517:prevention & control* / Q000523:psychology*; D011379:Prognosis; D055815:Young Adult