| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 3 |
1.5%
|
|
| 3 | 6 |
3%
|
|
| 4 | 8 |
4.1%
|
|
| 5 | 23 |
11.7%
|
|
| 6 | 34 |
17.3%
|
|
| 7 | 33 |
16.8%
|
|
| 8 | 31 |
15.7%
|
|
| 9 | 21 |
10.7%
|
|
| 10 | Very effective | 37 |
18.8%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 158 |