Contact InformationBack
| Date of survey | : | 20 - 26 February, 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. |
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| Sample size | : | 1,003 successful cases | |
| Effective Response rate | : | 76.5% | |
| Std. sampling error | : | Less than 1.6% |
| Table 1 Breakdown of contact information of the survey |
| Frequency | Percentage | |
| Respondents' ineligibility confirmed | 5,580 | 43.2% |
| Fax/ data line | 536 | 4.1% |
| Invalid number | 3,443 | 26.6% |
| Call-forwarding/ mobile/ pager number | 85 | 0.7% |
| Non-residential number | 575 | 4.4% |
| Special technological difficulties | 65 | 0.5% |
| No eligible respondents | 876 | 6.8% |
| Respondents' eligibility not confirmed | 3,153 | 24.4% |
| Line busy | 110 | 0.9% |
| No answer | 1,978 | 15.3% |
| Answering device | 40 | 0.3% |
| Call-blocking | 65 | 0.5% |
| Language problem | 235 | 1.8% |
| Interview terminated before the screening question | 489 | 3.8% |
| Others | 236 | 1.8% |
| Respondents' eligibility confirmed, but failed to complete the interview | 3,188 | 24.7% |
| Household-level refusal | 4 | 0.0% |
| Known respondent refusal | 0 | 0.0% |
| Appointment date beyond the end of the fieldwork period | 2768 | 21.4% |
| Partial interview | 38 | 0.3% |
| Miscellaneous | 378 | 2.9% |
| Successful cases | 1,003 | 7.8% |
| Total | 12,924 | 100.0% |
| Table 2 Calculation of effective response rate |
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