| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Much more effective | 291 |
24.3%
|
| 2 | Somewhat more effective | 333 |
27.8%
|
| 3 | About the same effectiveness | 174 |
14.5%
|
| 4 | Somewhat less effective | 199 |
16.6%
|
| 5 | Much less effective | 176 |
14.7%
|
| 7 | Not applicable | 0 |
0%
|
| 8 | Refused | 1 |
0.1%
|
| 9 | Don't know | 24 |
2%
|
| 97 | Not applicable (COV1 was 0, 8 or 9) | 2 |
0.2%
|