| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.9%
|
| 3 | 2 |
0.9%
|
|
| 4 | 6 |
2.7%
|
|
| 5 | 12 |
5.3%
|
|
| 6 | 16 |
7.1%
|
|
| 7 | 13 |
5.8%
|
|
| 8 | 33 |
14.7%
|
|
| 9 | 26 |
11.6%
|
|
| 10 | Very effective | 12 |
5.3%
|
| 11 | Don't know | 103 |
45.8%
|
| Sysmiss | 10 |