| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.2%
|
| 3 | 1 |
1.2%
|
|
| 4 | 3 |
3.5%
|
|
| 5 | 8 |
9.3%
|
|
| 6 | 12 |
14%
|
|
| 7 | 10 |
11.6%
|
|
| 8 | 26 |
30.2%
|
|
| 9 | 20 |
23.3%
|
|
| 10 | Very effective | 5 |
5.8%
|
| 11 | Don't know | 5 | |
| Sysmiss | 171 |