| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
0.5%
|
| 2 | 4 |
0.7%
|
|
| 3 | 9 |
1.5%
|
|
| 4 | 29 |
4.8%
|
|
| 5 | 29 |
4.8%
|
|
| 6 | 48 |
7.9%
|
|
| 7 | 53 |
8.7%
|
|
| 8 | 52 |
8.6%
|
|
| 9 | 27 |
4.5%
|
|
| 10 | Very effective | 18 |
3%
|
| 11 | Don't know | 296 |
48.8%
|
| Sysmiss | 38 |
6.3%
|