| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 5 |
0.2%
|
| 0 | Very ineffective | 949 |
39.5%
|
| 1 | Ineffective | 722 |
30.1%
|
| 2 | Effective | 260 |
10.8%
|
| 3 | Very effective | 76 |
3.2%
|
| 9 | Don’t know | 388 |
16.2%
|