| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.7%
|
| 2 | 3 |
2.1%
|
|
| 3 | 5 |
3.4%
|
|
| 4 | 5 |
3.4%
|
|
| 5 | 10 |
6.9%
|
|
| 6 | 24 |
16.6%
|
|
| 7 | 26 |
17.9%
|
|
| 8 | 41 |
28.3%
|
|
| 9 | 22 |
15.2%
|
|
| 10 | Very effective | 8 |
5.5%
|
| 11 | Don't know | 74 | |
| Sysmiss | 34 |