| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 36 |
3%
|
| 1 | Not very effective | 261 |
21.8%
|
| 2 | Somewhat effective | 556 |
46.3%
|
| 3 | Very effective | 326 |
27.2%
|
| 9 | Don't know | 21 |
1.8%
|
| 998 | Refused | 0 |
0%
|