| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.5%
|
| 2 | 2 | 4 |
2.9%
|
| 3 | 3 | 6 |
4.4%
|
| 4 | 4 | 9 |
6.6%
|
| 5 | 5 | 17 |
12.5%
|
| 6 | 6 | 14 |
10.3%
|
| 7 | 7 | 28 |
20.6%
|
| 8 | 8 | 16 |
11.8%
|
| 9 | 9 | 10 |
7.4%
|
| 10 | Very effective | 9 |
6.6%
|
| 11 | Don't know | 21 |
15.4%
|
| Sysmiss | 10 |