| Value | Category | Cases | |
|---|---|---|---|
| -99 | 3 |
1.7%
|
|
| 1 | Not effective at all | 6 |
3.5%
|
| 2 | 6 |
3.5%
|
|
| 3 | 10 |
5.8%
|
|
| 4 | 10 |
5.8%
|
|
| 5 | 17 |
9.9%
|
|
| 6 | 17 |
9.9%
|
|
| 7 | 9 |
5.2%
|
|
| 8 | 13 |
7.6%
|
|
| 9 | 9 |
5.2%
|
|
| 10 | Very effective | 28 |
16.3%
|
| 11 | Don't know | 44 |
25.6%
|
| Sysmiss | 3 |