| Value | Category | Cases | |
|---|---|---|---|
| 1 | Highly effective | 2993 |
15.5%
|
| 2 | Moderately effective | 10406 |
53.9%
|
| 3 | Ineffective | 2941 |
15.2%
|
| 4 | Don't know | 2975 |
15.4%
|