| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 1 |
0.5%
|
|
| 3 | 1 |
0.5%
|
|
| 4 | 4 |
2%
|
|
| 5 | 9 |
4.5%
|
|
| 6 | 14 |
7%
|
|
| 7 | 20 |
10%
|
|
| 8 | 23 |
11.4%
|
|
| 9 | 21 |
10.4%
|
|
| 10 | Very effective | 23 |
11.4%
|
| 11 | Don't know | 84 |
41.8%
|
| Sysmiss | 25 |