| Value | Category | Cases | |
|---|---|---|---|
| 1 | Highly effective | 1473 |
7.6%
|
| 2 | Effective | 4358 |
22.6%
|
| 3 | Moderately effective | 4817 |
24.9%
|
| 4 | Not effective | 3936 |
20.4%
|
| 5 | Don't know | 4730 |
24.5%
|