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  Date of survey : 17-21 July 2003
  Survey method : Telephone survey with interviewers
  Target population : Cantonese-speaking white-collars aged between 18 and 35
  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.
  Sample size : 515 successful cases
  Response rate : 77.1% (Based on target population)
  Std. sampling error : Less than 2.2%