| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.9%
|
| 2 | 6 |
2.6%
|
|
| 3 | 5 |
2.2%
|
|
| 4 | 12 |
5.2%
|
|
| 5 | 17 |
7.4%
|
|
| 6 | 21 |
9.2%
|
|
| 7 | 38 |
16.6%
|
|
| 8 | 28 |
12.2%
|
|
| 9 | 30 |
13.1%
|
|
| 10 | Very effective | 70 |
30.6%
|
| 11 | Don't know | 43 | |
| Sysmiss | 47 |