| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.7%
|
| 3 | 3 |
2.2%
|
|
| 4 | 5 |
3.7%
|
|
| 5 | 11 |
8.2%
|
|
| 6 | 21 |
15.7%
|
|
| 7 | 38 |
28.4%
|
|
| 8 | 40 |
29.9%
|
|
| 9 | 13 |
9.7%
|
|
| 10 | Very effective | 2 |
1.5%
|
| 11 | Don't know | 67 | |
| Sysmiss | 1 |