Contact InformationBack


  Date of survey : 26 April-4 May, 2004
  Survey method : Telephone survey with interviewers.
  Target population : Cantonese-speaking population of Hong Kong aged 18 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 : 1,009 successful cases.
  Response rate : 58.7%
  Std sampling error : Less than 1.6%

Table 1 - Detailed breakdown of contact information of the survey
   Frequency  Percentage
  Respondents' ineligibility confirmed  2,560   35.3 
  Fax / data line  323   4.5 
  Invalid number  1,449   20.0 
  Call-forwarding / mobile / pager number  37   0.5 
  Non-residential number  487   6.7 
  Special technological difficulties  152   2.1 
  No eligible respondents  112   1.5 
 
  Respondents' eligibility not confirmed  2,368   32.7 
  Line busy  106   1.5 
  No answer  1,197   16.5 
  Answering device  30   0.4 
  Call-blocking  240   3.3 
  Language problem  205   2.8 
  Interview terminated before the screening question  571   7.9 
  Others  19   0.3 
 
  Respondents' eligibility confirmed, but failed to complete the interview  1,320   18.2 
  Household-level refusal  7   0.1 
  Known respondent refusal  14   0.2 
  Appointment date beyond the end of the fieldwork period  1,174   16.2 
  Partial interview  118   1.6 
  Miscellaneous  7   0.1 
 
  Successful cases  1,009   13.9 
 
  Total  7,257   100.0 

Table 2 - Calculation of response rate

   Response rate
= [ Successful cases / (Successful cases + Incomplete cases* + Refusal cases by eligible respondents^) ]
= [ 1,009 / (1,009 + 689 + 21) ]
= 58.7%
* Including "partial interview" and "interview terminated before the screening question"
^ Including "household-level refusal" and "known respondent refusal"