| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 0 |
0%
|
| 2 | 1 |
0.5%
|
|
| 3 | 2 |
1%
|
|
| 4 | 4 |
2%
|
|
| 5 | 9 |
4.5%
|
|
| 6 | 15 |
7.5%
|
|
| 7 | 23 |
11.6%
|
|
| 8 | 21 |
10.6%
|
|
| 9 | 26 |
13.1%
|
|
| 10 | Very effective | 20 |
10.1%
|
| 11 | Don't know | 78 |
39.2%
|
| Sysmiss | 27 |