| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
2.5%
|
| 2 | 2 |
5%
|
|
| 3 | 2 |
5%
|
|
| 6 | 8 |
20%
|
|
| 7 | 7 |
17.5%
|
|
| 8 | 8 |
20%
|
|
| 9 | 6 |
15%
|
|
| 10 | Very effective | 6 |
15%
|
| 11 | Don't know | 54 | |
| Sysmiss | 15 |