| Value | Category | Cases | |
|---|---|---|---|
| -99 | 8 |
3.4%
|
|
| 1 | Not effective at all | 6 |
2.6%
|
| 2 | 4 |
1.7%
|
|
| 3 | 5 |
2.1%
|
|
| 4 | 11 |
4.7%
|
|
| 5 | 13 |
5.6%
|
|
| 6 | 29 |
12.4%
|
|
| 7 | 24 |
10.3%
|
|
| 8 | 26 |
11.2%
|
|
| 9 | 18 |
7.7%
|
|
| 10 | Very effective | 20 |
8.6%
|
| 11 | Don't know | 69 |
29.6%
|
| Sysmiss | 4 |