| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
1.5%
|
| 2 | 2 |
1%
|
|
| 3 | 3 |
1.5%
|
|
| 4 | 6 |
3%
|
|
| 5 | 15 |
7.5%
|
|
| 6 | 14 |
7%
|
|
| 7 | 18 |
9%
|
|
| 8 | 31 |
15.5%
|
|
| 9 | 10 |
5%
|
|
| 10 | Very effective | 15 |
7.5%
|
| 11 | Don't know | 83 |
41.5%
|
| Sysmiss | 26 |