| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
1.8%
|
| 10 | Very effective | 1 |
0.6%
|
| 11 | Don't know | 92 |
54.4%
|
| -99 | 9 |
5.3%
|
|
| 2 | 2 |
1.2%
|
|
| 3 | 5 |
3%
|
|
| 4 | 10 |
5.9%
|
|
| 5 | 18 |
10.7%
|
|
| 6 | 7 |
4.1%
|
|
| 7 | 12 |
7.1%
|
|
| 8 | 5 |
3%
|
|
| 9 | 5 |
3%
|
|
| Sysmiss | 22 |