| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 4 |
1.8%
|
|
| 3 | 8 |
3.7%
|
|
| 4 | 13 |
6%
|
|
| 5 | 21 |
9.7%
|
|
| 6 | 27 |
12.4%
|
|
| 7 | 22 |
10.1%
|
|
| 8 | 38 |
17.5%
|
|
| 9 | 20 |
9.2%
|
|
| 10 | Very effective | 63 |
29%
|
| 11 | Don't know | 50 | |
| Sysmiss | 52 |