Perceived efficacy of means of SARS prevention
| Date of interview | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Initial phase | Second phase | |||||||||||||
| 21.3 | 22.3 | 23.3 | 24.3 | 28.3 | 1.4 | 8.4 | 11.4 | 24.4 | 12.5 | All | p Value† | p Value‡ | p Value§ | |
| †For comparison from 21/3 to 1/4 and derived from two sided linear by linear χ2 test; | ||||||||||||||
| ‡For comparison from 1/4 to 12/5 and derived from two sided linear by linear χ2 test; | ||||||||||||||
| § χ2 tests for comparisons between phase 1 (not including 1/4) and phase 2; | ||||||||||||||
| *, ¶ and **OR ⩾1 and<2, ⩾2 and<4, ⩾4, respectively and p<0.05, for comparison with the reference (21/3) or the first column of data while controlling for age, gender, and levels of education; | ||||||||||||||
| ††, ‡‡ and §§OR⩾0.5 and<1, ⩾0.25 and<0.5, <0.25, respectively, and p<0.05, for comparison with the reference (21/3) or the first column while controlling for age, gender, and levels of education;—data not collected for those rounds of survey; | ||||||||||||||
| ***significantly increased from the intital phase to the second phase (p<0.05 by χ2 test); | ||||||||||||||
| ¶¶significantly decreased from the initial phase to the second phase (p<0.05 by χ2 test). | ||||||||||||||
| Hygienic means | ||||||||||||||
| Wearing a mask (% very effective/effective)§ | 79.5 | 78.8 | 72.2 | 75.8 | 84.0 | 84.9 | 86.1 | 85.8 | 80.0 | 80.8 | 81.7 | 0.034 | 0.171 | 0.037*** |
| Washing hands frequently (% very effective/effective)§ | 80.5 | 83.9 | 86.8 | 87.9 | 96.4** | 98.9** | 96.8** | 94.2** | 96.4** | 96.5** | 93.3 | <0.001 | 0.109 | <0.001*** |
| Disinfecting home (% very effective/effective)§ | – | – | – | 69.7 | 83.4¶ | 88.1¶ | 86.1¶ | 88.4¶ | 88.4¶ | 80.1* | 74.7 | 0.006 | 0.267 | 0.013*** |
| Avoid going to different places | ||||||||||||||
| Avoid going outside (% very useful/useful)§, ¶ | 62.8 | 55.8 | 61.5 | 51.5 | 72.8 | 75.1* | 69.6 | 70.3 | 61.2 | 48.3 | 63.9 | <0.001 | <0.001 | 0.324 |
| Avoid crowded places (% very useful/useful)§, ¶ | 83.4 | 91.7 | 90.1 | 84.8 | 91.7¶ | 95.1** | 91.8¶ | 95.5** | 90.2 | 81.3 | 90.2 | 0.010 | 0.002 | 0.426 |
| Avoid visiting hospitals/clinics (% very useful/useful) | 85.7 | 83.3 | 86.8 | 74.2 | 94.6¶ | 89.2 | 86.1 | 96.1** | 90.9 | 82.6 | 87.9 | 0.068 | 0.861 | 0.196 |
| Avoid using public transportation (% very useful/useful)§, ¶ | 41.0 | 40.4 | 57.1* | 37.9 | 65.7¶ | 63.2¶ | 52.5 | 52.3 | 51.2 | 32.7 | 50.5 | <0.001 | <0.001 | 0.999 |
| Avoid going to work (% very useful/useful)§, ¶ | 19.2 | 19.9 | 30.0 | 16.7 | 40.8¶ | 49.7** | 31.0 | 30.3 | 28.8 | 16.4 | 29.9 | <0.001 | <0.001 | 0.090 |
| Not allow kids to go to school (% very useful/useful)§, ¶ | – | – | – | 33.8 | 68.0** | 64.9¶ | 58.9¶ | 62.1¶ | 58.3¶ | 39.0 | 57.0 | 0.028 | 0.001 | 0.587 |
| Avoid going to mainland China(% very useful/useful) | – | – | – | – | 82.2 | 84.3 | 80.4 | 85.7 | 89.6 | 76.7 | 83.1 | 0.610 | 0.986 | 0.741 |
| Leave Hong Kong temporily (% very useful/useful) | 19.5 | 16.0 | 16.7 | 18.2 | 25.0 | 21.6 | 21.5 | 21.9 | 17.8 | 15.7 | 19.6 | 0.240 | 0.183 | 0.956 |