| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
1.5%
|
| 2 | 1 |
0.5%
|
|
| 3 | 7 |
3.4%
|
|
| 4 | 11 |
5.3%
|
|
| 5 | 20 |
9.7%
|
|
| 6 | 24 |
11.7%
|
|
| 7 | 25 |
12.1%
|
|
| 8 | 36 |
17.5%
|
|
| 9 | 24 |
11.7%
|
|
| 10 | Very effective | 55 |
26.7%
|
| 11 | Don't know | 62 | |
| Sysmiss | 51 |