| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.5%
|
| 2 | 3 |
2.2%
|
|
| 3 | 4 |
2.9%
|
|
| 4 | 7 |
5.1%
|
|
| 5 | 12 |
8.8%
|
|
| 6 | 27 |
19.9%
|
|
| 7 | 33 |
24.3%
|
|
| 8 | 27 |
19.9%
|
|
| 9 | 16 |
11.8%
|
|
| 10 | Very effective | 5 |
3.7%
|
| 11 | Don't know | 87 | |
| Sysmiss | 30 |