| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.8%
|
| 2 | 2 | 1 |
0.8%
|
| 3 | 3 | 7 |
5.4%
|
| 4 | 4 | 8 |
6.2%
|
| 5 | 5 | 10 |
7.8%
|
| 6 | 6 | 4 |
3.1%
|
| 7 | 7 | 17 |
13.2%
|
| 8 | 8 | 11 |
8.5%
|
| 9 | 9 | 6 |
4.7%
|
| 10 | Very effective | 4 |
3.1%
|
| 11 | Don't know | 60 |
46.5%
|
| Sysmiss | 17 |