| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.9%
|
| 2 | 0 |
0%
|
|
| 3 | 3 |
1.4%
|
|
| 4 | 4 |
1.9%
|
|
| 5 | 11 |
5.1%
|
|
| 6 | 19 |
8.8%
|
|
| 7 | 48 |
22.2%
|
|
| 8 | 33 |
15.3%
|
|
| 9 | 25 |
11.6%
|
|
| 10 | Very effective | 51 |
23.6%
|
| 11 | Don't know | 20 |
9.3%
|
| Sysmiss | 4 |