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 | Eleventh | Twelfth | Thirteenth | Fourteenth | Fifteenth | Sixteenth | Seventeenth | Eighteenth |
| 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 | Twenty-First | Twenty-Second | Twenty-Third | Twenty-Fourth | Twenty-Fifth | ||
| Survey date | 11/3 15:00 – 16/3 15:00 |
14/4 15:00 – 22/4 15:00 |
11/5 15:00 – 25/5 19:00 |
20/6 15:00 – 30/6 15:00 |
15/7 15:00 – 5/8 15:00 |
16/9 15:00 – 7/10 15:00 |
28/10 15:00 – 2/12 15:00 |
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| Total sample size | 6,324 | 4,151 | 4,801 | 4,866 | 3,821 | 4,832 | 4,467 | ||
| Response rate | 7.2% | 4.8% | 5.6% | 5.7% | 4.5% | 5.7% | 5.3% | ||
| 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. | ||||||||