| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 3 |
1.8%
|
|
| 3 | 13 |
7.6%
|
|
| 4 | 7 |
4.1%
|
|
| 5 | 14 |
8.2%
|
|
| 6 | 32 |
18.7%
|
|
| 7 | 23 |
13.5%
|
|
| 8 | 32 |
18.7%
|
|
| 9 | 33 |
19.3%
|
|
| 10 | Very effective | 13 |
7.6%
|
| 11 | Don't know | 199 | |
| Sysmiss | 51 |