| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Not at all effective | 300 |
24.9%
|
| 2 | Not very effective | 239 |
19.9%
|
| 3 | Pretty effective | 241 |
20%
|
| 4 | Very effective | 148 |
12.3%
|
| 8 | Refused | 17 |
1.4%
|
| 9 | Do not know or not enough to hear | 259 |
21.5%
|