| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.5%
|
| 2 | 8 |
5.9%
|
|
| 3 | 5 |
3.7%
|
|
| 4 | 9 |
6.6%
|
|
| 5 | 25 |
18.4%
|
|
| 6 | 15 |
11%
|
|
| 7 | 23 |
16.9%
|
|
| 8 | 16 |
11.8%
|
|
| 9 | 11 |
8.1%
|
|
| 10 | Very effective | 22 |
16.2%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 124 |