| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 |
1.6%
|
|
| 1 | Not effective at all | 2 |
0.5%
|
| 2 | 2 |
0.5%
|
|
| 3 | 2 |
0.5%
|
|
| 4 | 2 |
0.5%
|
|
| 5 | 14 |
3.7%
|
|
| 6 | 39 |
10.3%
|
|
| 7 | 52 |
13.7%
|
|
| 8 | 85 |
22.4%
|
|
| 9 | 41 |
10.8%
|
|
| 10 | Very effective | 25 |
6.6%
|
| 11 | Don't know | 110 |
28.9%
|
| Sysmiss | 49 |