| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.2%
|
| 10 | Very effective | 5 |
3%
|
| 11 | Don't know | 67 |
39.6%
|
| -99 | 11 |
6.5%
|
|
| 2 | 9 |
5.3%
|
|
| 3 | 9 |
5.3%
|
|
| 4 | 7 |
4.1%
|
|
| 5 | 14 |
8.3%
|
|
| 6 | 7 |
4.1%
|
|
| 7 | 13 |
7.7%
|
|
| 8 | 19 |
11.2%
|
|
| 9 | 6 |
3.6%
|
|
| Sysmiss | 22 |