| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.8%
|
| 2 | 1 |
0.9%
|
|
| 3 | 3 |
2.7%
|
|
| 4 | 11 |
9.9%
|
|
| 5 | 16 |
14.4%
|
|
| 6 | 22 |
19.8%
|
|
| 7 | 23 |
20.7%
|
|
| 8 | 24 |
21.6%
|
|
| 9 | 4 |
3.6%
|
|
| 10 | Very effective | 5 |
4.5%
|
| 11 | Don't know | 131 | |
| Sysmiss | 27 |