Contact InformationBack


  Date of survey : 16-20 January, 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 : 1,008 successful cases.
  Response rate : 61.7%
  Std sampling error : Less than 1.6%

Table 1 - Detailed breakdown of contact information of the survey
   Frequency  Percentage
  Respondents' ineligibility confirmed  2,390   33.2 
  Fax / data line  393   5.5 
  Invalid number  1,338   18.6 
  Call-forwarding / mobile / pager number  23   0.3 
  Non-residential number  414   5.7 
  Special technological difficulties  119   1.7 
  No eligible respondents  103   1.4 
 
  Respondents' eligibility not confirmed  2,845   39.4 
  Line busy  281   3.9 
  No answer  1,494   20.7 
  Answering device  29   0.4 
  Call-blocking  259   3.6 
  Language problem  225   3.1 
  Interview terminated before the screening question  518   7.2 
  Others  39   0.5 
 
  Respondents' eligibility confirmed, but failed to complete the interview  966   13.5 
  Household-level refusal  11   0.2 
  Known respondent refusal  7   0.1 
  Appointment date beyond the end of the fieldwork period  786   10.9 
  Partial interview  89   1.3 
  Miscellaneous  73   1.0 
 
  Successful cases  1,008   14.0 
 
  Total  7,209   100.0 

Table 2 - Calculation of response rate

   Response rate
= [ Successful cases / (Successful cases + Incomplete cases* + Refusal cases by eligible respondents^) ]
= [ 1,008 / (1,008 + 607 + 18) ]
= 61.7%
* Including "partial interview" and "interview terminated before the screening question"
^ Including "household-level refusal" and "known respondent refusal"