| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.5%
|
|
| 1 | Not effective at all | 6 |
2.8%
|
| 2 | 1 |
0.5%
|
|
| 3 | 6 |
2.8%
|
|
| 4 | 9 |
4.1%
|
|
| 5 | 36 |
16.6%
|
|
| 6 | 13 |
6%
|
|
| 7 | 23 |
10.6%
|
|
| 8 | 11 |
5.1%
|
|
| 9 | 14 |
6.5%
|
|
| 10 | Very effective | 16 |
7.4%
|
| 11 | Don't know | 81 |
37.3%
|
| Sysmiss | 4 |