| Contact Information |
| Date of survey | : | 28 - 31 July,2008 | |
| Survey method | : | Telephone survey with interviewers | |
| Target population | : | Hong Kong working population of age 18 or above | |
| Sampling method | : | All data were collected by our interviewers using a Computer Assisted Telephone Interview (CATI) system which allowed real-time data capture and consolidation. To ensure data quality, on top of on-site supervision, voice recording, screen capturing and camera surveillance were used to monitor the interviewers' performance. |
|
| Sample size | : | 1,003 successful cases | |
| Effective Response rate | : | 75.9% | |
| Std. sampling error | : | Less than 1.6% |
| Table 1 Breakdown of contact information of the survey |
| �@ | Frequency | Percentage |
Respondents' ineligibility confirmed |
1,153 |
16.3 |
Fax/ data line |
75 | 1.1 |
Invalid number |
609 | 8.6 |
Call-forwarding/ mobile/ pager number |
75 | 1.1 |
Non-residential number |
82 | 1.2 |
Special technological difficulties |
15 | 0.2 |
No eligible respondents |
297 | 4.2 |
| �@ | �@ | �@ |
Respondents' eligibility not confirmed |
2,058 |
29.1 |
Line busy |
87 | 1.2 |
No answer |
1,338 | 18.9 |
Answering device |
20 | 0.3 |
Call-blocking |
11 | 0.2 |
Language problem |
84 | 1.2 |
Interview terminated before the screening question |
382 | 5.4 |
Others |
136 | 1.9 |
|
�@ | �@ |
Respondents' eligibility confirmed, but failed to complete the interview |
2,861 |
40.4 |
Household-level refusal |
3 | 0.0 |
Known respondent refusal |
3 | 0.0 |
Appointment date beyond the end of the fieldwork period |
2522 | 35.6 |
Partial interview |
17 | 0.2 |
Miscellaneous |
316 | 4.5 |
|
�@ | �@ |
Successful cases |
1,003 |
14.2 |
|
�@ | �@ |
Total |
7,075 |
100.0 |
| Table 2 Calculation of effective response rate |
|