| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 6 |
3.7%
|
|
| 3 | 7 |
4.3%
|
|
| 4 | 11 |
6.8%
|
|
| 5 | 16 |
9.9%
|
|
| 6 | 22 |
13.7%
|
|
| 7 | 30 |
18.6%
|
|
| 8 | 44 |
27.3%
|
|
| 9 | 16 |
9.9%
|
|
| 10 | Very effective | 8 |
5%
|
| 11 | Don't know | 56 | |
| Sysmiss | 36 |