| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 68 |
5.7%
|
| 1 | Not very effective | 183 |
15.4%
|
| 2 | Somewhat effective | 324 |
27.2%
|
| 3 | Very effective | 451 |
37.9%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 165 |
13.9%
|