The target population of this survey was Macau citizens aged 18 or above. When telephone contact was successfully established with a target household, one person aged 18 or above was selected. If more than one subject had been available, selection was made using the "next birthday rule" which selected the person who had his/her birthday next from all those present.
Telephone interviews were conducted during the period of 18 to 28 November 2005. A total of 1,005 Macau citizens aged 18 or above were successfully interviewed. The overall response rate of this survey was 50.6% (Table 2), and the standard sampling error for percentages based on this sample was less than 1.6 percentage points. In other words, the sampling error for all percentages was less than plus/minus 3.2 percentage points at 95% confidence level.
|Table 1 - Breakdown of contact information of the survey|
|Respondents' ineligibility confirmed||751||21.0|
|Fax/ data line||42||1.2|
|Call-forwarding/ mobile/ pager number||15||0.4|
|Special technological difficulties||12||0.3|
|No eligible respondents||82||2.3|
|Respondents' eligibility not confirmed||1,724||48.3|
|Interview terminated before the screening question||960||26.9|
|Respondents' eligibility confirmed, but failed to complete the interview||90||2.5|
|Known respondent refusal||8||0.2|
|Appointment date beyond the fieldwork period||9||0.3|
|Table 2 - Calculation of overall response rate|
^ Including "household-level refusal" and "known respondent refusal"