| Value | Category | Cases | |
|---|---|---|---|
| 1 | Highly effective | 3524 |
18.2%
|
| 2 | Moderately effective | 9550 |
49.3%
|
| 3 | Ineffective | 3192 |
16.5%
|
| 4 | Don't know | 3113 |
16.1%
|