| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
1.4%
|
| 2 | 1 |
0.5%
|
|
| 3 | 8 |
3.8%
|
|
| 4 | 6 |
2.9%
|
|
| 5 | 7 |
3.3%
|
|
| 6 | 24 |
11.5%
|
|
| 7 | 50 |
23.9%
|
|
| 8 | 47 |
22.5%
|
|
| 9 | 33 |
15.8%
|
|
| 10 | Very effective | 30 |
14.4%
|
| 11 | Don't know | 167 | |
| Sysmiss | 45 |