title: Bar coding--a functional tool in survey research.
abstract: OBJECTIVE
  The aim was to assess the value of bar coding, together with developed microcomputer programs, as a tool to speed up mailing and handling of return responses of a survey where over 4000 adolescents received a mailed questionnaire.
  
  
  METHODS
  Bar codes were used for displaying the identification number of a questionnaire, as well as each response alternative and number of the question. These bar codes were read by a wand, a handhold scanner, connected to a microcomputer and the data were automatically entered into a computer data file.
  
  
  CONCLUSIONS
  Compared with previous similar surveys, the use of bar codes did not seem to affect a manner of responding. Bar coding saved human steps in handling of return responses, reduced an error rate, and helped to control the process of work. Bar coding is recommended as a new technical tool for preparations of future large scale surveys.
authors.affiliation: Department of Public Health, University of Helsinki, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Siivola
authors.forename: A
authors.initials: A
authors.lastname: Rimpelä
authors.forename: S
authors.initials: S
authors.lastname: Karvonen
authors.forename: M
authors.initials: M
authors.lastname: Rimpelä
mesh_terms: D001292:Attitude to Computers; D003625:Data Collection; D001330:Electronic Data Processing; D011795:Surveys and Questionnaires