| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.5%
|
| 3 | 2 |
1.5%
|
|
| 4 | 1 |
0.7%
|
|
| 5 | 9 |
6.7%
|
|
| 6 | 12 |
8.9%
|
|
| 7 | 22 |
16.3%
|
|
| 8 | 39 |
28.9%
|
|
| 9 | 33 |
24.4%
|
|
| 10 | Very effective | 15 |
11.1%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 29 |