| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.3%
|
|
| 1 | Not effective at all | 6 |
1.6%
|
| 2 | 12 |
3.1%
|
|
| 3 | 10 |
2.6%
|
|
| 4 | 16 |
4.1%
|
|
| 5 | 47 |
12.2%
|
|
| 6 | 54 |
14%
|
|
| 7 | 40 |
10.4%
|
|
| 8 | 50 |
13%
|
|
| 9 | 17 |
4.4%
|
|
| 10 | Very effective | 9 |
2.3%
|
| 11 | Don't know | 124 |
32.1%
|
| Sysmiss | 40 |