| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.8%
|
| 2 | 2 | 2 |
1.6%
|
| 3 | 3 | 8 |
6.4%
|
| 4 | 4 | 9 |
7.2%
|
| 5 | 5 | 9 |
7.2%
|
| 6 | 6 | 12 |
9.6%
|
| 7 | 7 | 7 |
5.6%
|
| 8 | 8 | 2 |
1.6%
|
| 9 | 9 | 5 |
4%
|
| 10 | Very effective | 2 |
1.6%
|
| 11 | Don't know | 68 |
54.4%
|
| Sysmiss | 21 |