| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 42 |
3.5%
|
| 1 | Not very effective | 324 |
27.2%
|
| 2 | Somewhat effective | 410 |
34.4%
|
| 3 | Very effective | 332 |
27.9%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 83 |
7%
|