Confusion between euthanasia and other end-of-life decisions: influences on public opinion poll results.

BACKGROUND: Public opinion polls indicate that a majority of Canadians are in favour of euthanasia. However, there have been many criticisms of the validity of these findings. The objective of this study was to assess public opinion towards euthanasia while controlling for possible threats to validity indicated in the literature review. METHODS: A telephone public opinion poll was conducted in 2002 with a representative sample of the general population of Quebec (n = 991; response rate = 49.8%). Respondents were asked about their support for euthanasia and treatment withdrawal and, for comparison, were asked a previously used question on euthanasia (Gallup) which has been criticized for methodological problems. Respondents were also asked to distinguish between euthanasia and other end-of-life decisions in hypothetical scenarios. RESULTS: Eleven percent more people supported euthanasia with the Gallup question than the question developed in this study. Support for euthanasia (69.6%) was less prevalent than for treatment withdrawal (85.8%). Respondents who failed to distinguish between euthanasia and treatment withdrawal or withholding treatment in hypothetical scenarios were more likely to support euthanasia in public opinion poll questions. Furthermore, there is a significant relationship between opinions about the acceptability of euthanasia and inaccurate knowledge of the nature of euthanasia. INTERPRETATION: Public opinion polls on euthanasia must be interpreted in the light of the wording of the question. Education of the population concerning euthanasia and other end-of-life decisions may be considered to be an important prerequisite to engage in public debate concerning the legalization of euthanasia.