| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.4%
|
|
| 1 | Not effective at all | 9 |
3.5%
|
| 2 | 13 |
5.1%
|
|
| 3 | 41 |
16%
|
|
| 4 | 44 |
17.2%
|
|
| 5 | 28 |
10.9%
|
|
| 6 | 19 |
7.4%
|
|
| 7 | 15 |
5.9%
|
|
| 8 | 15 |
5.9%
|
|
| 9 | 9 |
3.5%
|
|
| 10 | Very effective | 12 |
4.7%
|
| 11 | Don't know | 50 |
19.5%
|
| Sysmiss | 4 |