| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.5%
|
| 2 | 2 |
3.1%
|
|
| 3 | 1 |
1.5%
|
|
| 4 | 2 |
3.1%
|
|
| 5 | 4 |
6.2%
|
|
| 6 | 1 |
1.5%
|
|
| 7 | 4 |
6.2%
|
|
| 8 | 1 |
1.5%
|
|
| 11 | Don’t know | 29 |
44.6%
|
| Sysmiss | 20 |
30.8%
|