| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.8%
|
| 2 | 2 | 3 |
2.5%
|
| 3 | 3 | 5 |
4.1%
|
| 4 | 4 | 7 |
5.8%
|
| 5 | 5 | 13 |
10.7%
|
| 6 | 6 | 8 |
6.6%
|
| 7 | 7 | 7 |
5.8%
|
| 8 | 8 | 5 |
4.1%
|
| 9 | 9 | 2 |
1.7%
|
| 10 | Very effective | 1 |
0.8%
|
| 11 | Don't know | 69 |
57%
|
| Sysmiss | 25 |