| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.2%
|
| 10 | Very effective | 5 |
3%
|
| 11 | Don't know | 88 |
52.4%
|
| -99 | 12 |
7.1%
|
|
| 2 | 2 |
1.2%
|
|
| 3 | 9 |
5.4%
|
|
| 4 | 6 |
3.6%
|
|
| 5 | 10 |
6%
|
|
| 6 | 9 |
5.4%
|
|
| 7 | 9 |
5.4%
|
|
| 8 | 13 |
7.7%
|
|
| 9 | 3 |
1.8%
|
|
| Sysmiss | 23 |