|Date of survey||:||12 - 18/1/2006|
|Survey method||:||Telephone survey with interviewers|
|Target population||:||Cantonese-speaking population of Hong Kong of age 18 or above|
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.
The data collected have been weighted according to preliminary figures obtained from the Census and Statistics Department regarding the gender-age distribution of the Hong Kong population in mid-2005.
|Sample size||:||510 successful cases|
|Standard error||:||Less than 2.2%|
|Table 1 Calculation of response rate|
^ Including "household-level refusal" and "known respondent refusal"
|Table 2 Breakdown of contact information of the survey|
|Respondents' ineligibility confirmed||1,630||36.4|
|Fax/ data line||192||4.3|
|Call-forwarding/ mobile/ pager number||34||0.8|
|Special technological difficulties||47||1.0|
|No eligible respondents||38||0.8|
|Respondents' eligibility not confirmed||1,120||25.0|
|Interview terminated before the screening question||307||6.9|
|Respondents' eligibility confirmed, but failed to complete the interview||1,220||27.3|
|Known respondent refusal||3||0.1|
|Appointment date beyond the fieldwork period||1,176||26.3|