| Value | Category | Cases | |
|---|---|---|---|
| 1 | Highly effective | 2953 |
15.2%
|
| 2 | Effective | 6583 |
33.9%
|
| 3 | Moderately effective | 4446 |
22.9%
|
| 4 | Not effective | 2460 |
12.7%
|
| 5 | Don't know | 2980 |
15.3%
|