| Value | Category | Cases | |
|---|---|---|---|
| 1 | Highly effective | 2738 |
14.1%
|
| 2 | Effective | 6357 |
32.6%
|
| 3 | Moderately effective | 5040 |
25.9%
|
| 4 | Not effective | 2409 |
12.4%
|
| 5 | Don't know | 2934 |
15.1%
|