| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.3%
|
| 2 | 6 |
2.1%
|
|
| 3 | 15 |
5.2%
|
|
| 4 | 6 |
2.1%
|
|
| 5 | 22 |
7.7%
|
|
| 6 | 18 |
6.3%
|
|
| 7 | 33 |
11.5%
|
|
| 8 | 19 |
6.6%
|
|
| 9 | 10 |
3.5%
|
|
| 10 | Very effective | 3 |
1%
|
| 11 | Don't know | 153 |
53.5%
|
| Sysmiss | 16 |