| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 3 |
1.5%
|
|
| 3 | 5 |
2.5%
|
|
| 4 | 12 |
6.1%
|
|
| 5 | 19 |
9.6%
|
|
| 6 | 29 |
14.6%
|
|
| 7 | 32 |
16.2%
|
|
| 8 | 38 |
19.2%
|
|
| 9 | 22 |
11.1%
|
|
| 10 | Very effective | 37 |
18.7%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 157 |