| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.3%
|
| 2 | 6 |
1%
|
|
| 3 | 11 |
1.8%
|
|
| 4 | 27 |
4.5%
|
|
| 5 | 31 |
5.1%
|
|
| 6 | 52 |
8.6%
|
|
| 7 | 55 |
9.1%
|
|
| 8 | 55 |
9.1%
|
|
| 9 | 34 |
5.6%
|
|
| 10 | Very effective | 26 |
4.3%
|
| 11 | Don't know | 251 |
41.4%
|
| Sysmiss | 56 |
9.2%
|