| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.3%
|
|
| 1 | Not effective at all | 2 |
0.6%
|
| 2 | 2 |
0.6%
|
|
| 3 | 4 |
1.2%
|
|
| 4 | 6 |
1.8%
|
|
| 5 | 21 |
6.3%
|
|
| 6 | 25 |
7.5%
|
|
| 7 | 51 |
15.3%
|
|
| 8 | 69 |
20.7%
|
|
| 9 | 19 |
5.7%
|
|
| 10 | Very effective | 12 |
3.6%
|
| 11 | Don't know | 122 |
36.5%
|
| Sysmiss | 6 |