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  Date of survey : 27 November - 10 December 2003
  Survey method : Telephone survey with interviewers
  Target population : Hong Kong population aged 15 or above
  Sampling method :
Standard POP telephone sampling method was used. Telephone numbers were selected randomly from residential telephone directories and mixed with additional numbers generated by the computer. If more than one subject had been available, the one who had his/her birthday next was selected.
  Weighting method :
The data reported have been adjusted according to the age and gender distributions of the Hong Kong population as reported in the 2001 Population Census.
  Sample size : 2,026 successful cases
  Response rate : 57.0%
  Std. sampling error : Less than 1.1%