| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 0 |
0%
|
|
| 3 | 3 |
1.5%
|
|
| 4 | 4 |
2%
|
|
| 5 | 17 |
8.6%
|
|
| 6 | 19 |
9.6%
|
|
| 7 | 16 |
8.1%
|
|
| 8 | 18 |
9.1%
|
|
| 9 | 11 |
5.6%
|
|
| 10 | Very effective | 17 |
8.6%
|
| 11 | Don't know | 91 |
46.2%
|
| Sysmiss | 29 |