| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.5%
|
|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 2 |
0.9%
|
|
| 3 | 2 |
0.9%
|
|
| 4 | 11 |
5.1%
|
|
| 5 | 20 |
9.3%
|
|
| 6 | 14 |
6.5%
|
|
| 7 | 27 |
12.6%
|
|
| 8 | 26 |
12.1%
|
|
| 9 | 24 |
11.2%
|
|
| 10 | Very effective | 27 |
12.6%
|
| 11 | Don't know | 60 |
27.9%
|
| Sysmiss | 5 |