| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.8%
|
| 2 | 4 |
1.5%
|
|
| 3 | 15 |
5.8%
|
|
| 4 | 25 |
9.7%
|
|
| 5 | 31 |
12%
|
|
| 6 | 62 |
23.9%
|
|
| 7 | 57 |
22%
|
|
| 8 | 40 |
15.4%
|
|
| 9 | 15 |
5.8%
|
|
| 10 | Very effective | 8 |
3.1%
|
| 11 | Don't know | 92 | |
| Sysmiss | 15 |