| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 |
1.5%
|
|
| 1 | Not effective at all | 6 |
1.5%
|
| 2 | 11 |
2.8%
|
|
| 3 | 16 |
4.1%
|
|
| 4 | 21 |
5.3%
|
|
| 5 | 45 |
11.4%
|
|
| 6 | 30 |
7.6%
|
|
| 7 | 30 |
7.6%
|
|
| 8 | 13 |
3.3%
|
|
| 9 | 19 |
4.8%
|
|
| 10 | Very effective | 16 |
4.1%
|
| 11 | Don't know | 182 |
46.1%
|
| Sysmiss | 12 |