| Value | Category | Cases | |
|---|---|---|---|
| 1 | Highly effective | 1470 |
7.6%
|
| 2 | Effective | 4301 |
22.2%
|
| 3 | Moderately effective | 5568 |
28.8%
|
| 4 | Not effective | 3826 |
19.8%
|
| 5 | Don't know | 4175 |
21.6%
|