| Value | Category | Cases | |
|---|---|---|---|
| -99 | 15 |
3.9%
|
|
| 1 | Not effective at all | 5 |
1.3%
|
| 2 | 1 |
0.3%
|
|
| 3 | 7 |
1.8%
|
|
| 4 | 13 |
3.4%
|
|
| 5 | 38 |
10%
|
|
| 6 | 32 |
8.4%
|
|
| 7 | 50 |
13.2%
|
|
| 8 | 35 |
9.2%
|
|
| 9 | 23 |
6.1%
|
|
| 10 | Very effective | 8 |
2.1%
|
| 11 | Don't know | 153 |
40.3%
|
| Sysmiss | 4 |