| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 |
1.8%
|
| 2 | 3 |
1.4%
|
|
| 3 | 10 |
4.5%
|
|
| 4 | 12 |
5.5%
|
|
| 5 | 21 |
9.5%
|
|
| 6 | 20 |
9.1%
|
|
| 7 | 31 |
14.1%
|
|
| 8 | 26 |
11.8%
|
|
| 9 | 26 |
11.8%
|
|
| 10 | Very effective | 67 |
30.5%
|
| 11 | Don't know | 47 | |
| Sysmiss | 52 |