Appendix 1: Summary table for the contact information of the Benchmark Surveys
| Survey year | 2021 | ||||||||
| Benchmark Survey | First | Second | Third | Fourth | Fifth | Sixth | Seventh | Eighth | Ninth |
| Survey date | 18/1 15:00 – 25/1 15:00 |
25/1 15:00 – 18/2 15:00 |
18/2 15:00 – 24/2 15:00 |
24/2 15:00 – 1/3 15:00 |
1/3 15:00 – 8/3 15:00 |
8/3 15:00 – 22/3 15:00 |
22/3 15:00 – 29/3 15:00 |
16/4 15:00 – 21/4 15:00 |
17/5 15:00 – 24/5 15:00 |
| Total sample size | 4,821 | 4,950 | 6,542 | 6,605 | 5,606 | 6,210 | 6,806 | 6,330 | 6,583 |
| Response rate | 5.0% | 5.2% | 6.8% | 6.9% | 5.9% | 6.5% | 7.2% | 6.7% | 7.0% |
| Survey year | 2021 | 2022 | |||||||
| Benchmark Survey | Tenth | Eleven | Twelve | Thirteen | Fourteen | Fifteen | Sixteen | Seventeen | Eighteen |
| Survey date | 18/6 15:00 – 23/6 15:00 |
16/7 15:00 – 21/7 15:00 |
16/8 15:00 – 23/8 15:00 |
13/9 15:00 – 20/9 15:00 |
18/10 15:00 – 25/10 15:00 |
23/11 15:00 – 29/11 15:00 |
17/12 15:00 – 27/12 15:00 |
17/1 15:00 – 24/1 15:00 |
14/2 15:00 – 18/2 19:00 |
| Total sample size | 6,158 | 5,636 | 7,456 | 6,210 | 5,974 | 5,888 | 5,063 | 5,043 | 4,984 |
| Response rate | 6.6% | 6.1% | 8.1% | 6.8% | 6.6% | 6.6% | 5.7% | 5.7% | 5.7% |
| Survey year | 2022 | ||||||||
| Benchmark Survey | Nineteenth | Twentieth | |||||||
| Survey date | 11/3 15:00 – 16/3 15:00 |
14/4 15:00 – 22/4 15:00 |
|||||||
| Total sample size | 6,324 | 4,151 | |||||||
| Response rate | 7.2% | 4.8% | |||||||
| Survey method | Online survey | ||||||||
| Target population | Hong Kong residents aged 12+ | ||||||||
| Sampling error | Sampling error of percentages at +/-1% at 95% confidence level | ||||||||
| Weighting method | Rim-weighted according to 1) gender-age distribution, educational attainment (highest level attended) distribution and economic activity status distribution of Hong Kong population from Census and Statistics Department; 2) appraisal of political condition and political inclination distribution from regular tracking surveys. | ||||||||