| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 3 |
1.9%
|
|
| 3 | 1 |
0.6%
|
|
| 4 | 4 |
2.6%
|
|
| 5 | 10 |
6.5%
|
|
| 6 | 25 |
16.1%
|
|
| 7 | 36 |
23.2%
|
|
| 8 | 38 |
24.5%
|
|
| 9 | 19 |
12.3%
|
|
| 10 | Very effective | 18 |
11.6%
|
| 11 | Don't know | 62 | |
| Sysmiss | 36 |