| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
0.9%
|
| 2 | 9 |
2.7%
|
|
| 3 | 19 |
5.6%
|
|
| 4 | 19 |
5.6%
|
|
| 5 | 45 |
13.4%
|
|
| 6 | 68 |
20.2%
|
|
| 7 | 57 |
16.9%
|
|
| 8 | 57 |
16.9%
|
|
| 9 | 32 |
9.5%
|
|
| 10 | Very effective | 28 |
8.3%
|
| 11 | Don't know | 17 | |
| Sysmiss | 12 |