| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 8 |
2.9%
|
| 2 | 7 |
2.5%
|
|
| 3 | 7 |
2.5%
|
|
| 4 | 6 |
2.2%
|
|
| 5 | 24 |
8.7%
|
|
| 6 | 7 |
2.5%
|
|
| 7 | 17 |
6.2%
|
|
| 8 | 18 |
6.5%
|
|
| 9 | 14 |
5.1%
|
|
| 10 | Very effective | 34 |
12.4%
|
| 11 | Don't know | 133 |
48.4%
|
| Sysmiss | 18 |