| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 4 |
2.1%
|
|
| 3 | 4 |
2.1%
|
|
| 4 | 6 |
3.1%
|
|
| 5 | 7 |
3.6%
|
|
| 6 | 15 |
7.7%
|
|
| 7 | 27 |
13.8%
|
|
| 8 | 31 |
15.9%
|
|
| 9 | 15 |
7.7%
|
|
| 10 | Very effective | 14 |
7.2%
|
| 11 | Don't know | 71 |
36.4%
|
| Sysmiss | 6 |