| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.3%
|
|
| 1 | Not effective at all | 2 |
0.6%
|
| 2 | 3 |
0.9%
|
|
| 3 | 2 |
0.6%
|
|
| 4 | 5 |
1.5%
|
|
| 5 | 16 |
4.8%
|
|
| 6 | 29 |
8.7%
|
|
| 7 | 50 |
14.9%
|
|
| 8 | 72 |
21.5%
|
|
| 9 | 40 |
11.9%
|
|
| 10 | Very effective | 14 |
4.2%
|
| 11 | Don't know | 101 |
30.1%
|
| Sysmiss | 5 |