title: Influence of an educational videotape on attitudes toward participating in cohort studies--results of a randomized controlled trial.
abstract: OBJECTIVE
  This study was conducted to examine whether an educational videotape might change peoples' attitudes toward participating in future cohort studies by a prospective randomized controlled trial.
  
  
  METHODS
  The participants were recruited from the residents of Kamogawa-city (139 at a health promotion festival, 54 from a nursery care study class, 53 from an elderly class, and 9 individuals who had not attended a health checkup for more than 10 years). All participants were randomized into a control group and an intervention group, and were asked to fill out a questionnaire designed to evaluate attitudes toward participating in future cohort studies. Those in the intervention group, however, were also asked to watch a videotape, produced by the authors to explain the objectives, significance, and security policies of a cohort study planned to be conducted in the same city, before completing the questionnaire.
  
  
  RESULTS
  In the intervention group, 44% (54/123) showed a positive attitude to future participation, while the figure was only 25% (31/122) in the control group (Cochran-Mantel-Haenszel chi2: P=0.0025).
  
  
  CONCLUSIONS
  The videotape proved to be a useful tool for informing the general public about the nature of cohort studies and to increasing probable participation.
authors.affiliation: Department of Biostatistics, School of Public Health, University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
authors.forename: Mitsuko
authors.initials: M
authors.lastname: Ishii
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Ohashi
mesh_terms: D000368:Aged; D001291:Attitude of Health Personnel; D015331:Cohort Studies; D003299:Cooperative Behavior; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D007258:Informed Consent; D008297:Male; D008875:Middle Aged; D010353:Patient Education as Topic; D011446:Prospective Studies; D014743:Videotape Recording