| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 189 |
15.9%
|
| 1 | Not very effective | 131 |
11%
|
| 2 | Somewhat effective | 278 |
23.3%
|
| 3 | Very effective | 495 |
41.6%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 98 |
8.2%
|