| Value | Category | Cases | |
|---|---|---|---|
| 1 | Highly effective | 1477 |
7.6%
|
| 2 | Effective | 4537 |
23.4%
|
| 3 | Moderately effective | 5287 |
27.3%
|
| 4 | Not effective | 2469 |
12.8%
|
| 5 | Don't know | 5585 |
28.9%
|