| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 5 |
1.5%
|
| 2 | 7 |
2.1%
|
|
| 3 | 5 |
1.5%
|
|
| 4 | 11 |
3.4%
|
|
| 5 | 21 |
6.4%
|
|
| 6 | 39 |
11.9%
|
|
| 7 | 61 |
18.6%
|
|
| 8 | 58 |
17.7%
|
|
| 9 | 24 |
7.3%
|
|
| 10 | Very effective | 17 |
5.2%
|
| 11 | Don't know | 80 |
24.4%
|
| Sysmiss | 12 |