title: International questionnaire postal response rate: an experiment comparing no return postage to provision of International Postage Vouchers--"Coupon-Réponse International".
abstract: BACKGROUND
  Previous studies of methods to increase response rates on international postal surveys did not include providing return postage. We provided International Postage Vouchers--"Coupon-Réponse International" to cover this. The objective of this study was to see if these International Postage Vouchers had an effect on response rates.
  
  
  METHODS
  Between-groups, randomized, after-only.
  
  
  RESULTS
  There was no difference in response rates between the group that received International Postage Vouchers and the group that did not. (p = 0.23).
  
  
  CONCLUSIONS
  International Postage Vouchers--"Coupon-Réponse International" have no effect on response rates for international postal surveys.
authors.affiliation: Informed Choice Research Department, Norwegian Health Services Research Centre, Postboks 7004 St. Olavs Plass, 0130 Oslo, Norway. cheryl.carling@nchs.no
authors.forename: Cheryl
authors.initials: C
authors.lastname: Carling
mesh_terms: D003144:Communication Barriers; D003258:Consumer Behavior / Q000191:economics* / Q000706:statistics & numerical data; D034742:Electronic Mail / Q000191:economics / Q000706:statistics & numerical data; D006801:Humans; D033181:Information Dissemination; D038622:Internationality; D020407:Internet / Q000191:economics / Q000706:statistics & numerical data; D018156:Journalism, Medical; D009042:Motivation; D009664:Norway; D011177:Postal Service / Q000191:economics*; D011795:Surveys and Questionnaires / Q000191:economics* / Q000706:statistics & numerical data