| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.7%
|
| 2 | 3 |
2.2%
|
|
| 3 | 6 |
4.3%
|
|
| 4 | 10 |
7.2%
|
|
| 5 | 18 |
12.9%
|
|
| 6 | 21 |
15.1%
|
|
| 7 | 24 |
17.3%
|
|
| 8 | 27 |
19.4%
|
|
| 9 | 20 |
14.4%
|
|
| 10 | Very effective | 9 |
6.5%
|
| 11 | Don't know | 80 | |
| Sysmiss | 34 |