| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 4 |
2.5%
|
|
| 3 | 4 |
2.5%
|
|
| 4 | 7 |
4.4%
|
|
| 5 | 24 |
15.1%
|
|
| 6 | 50 |
31.4%
|
|
| 7 | 25 |
15.7%
|
|
| 8 | 20 |
12.6%
|
|
| 9 | 16 |
10.1%
|
|
| 10 | Very effective | 8 |
5%
|
| 11 | Don't know | 11 | |
| Sysmiss | 33 |