| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Not at all effective | 202 |
16.8%
|
| 2 | Not very effective | 177 |
14.8%
|
| 3 | Somewhat effective | 405 |
33.8%
|
| 4 | Very effective | 287 |
23.9%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 129 |
10.8%
|