| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.2%
|
| 2 | 1 |
1.2%
|
|
| 3 | 1 |
1.2%
|
|
| 4 | 3 |
3.6%
|
|
| 5 | 11 |
13.3%
|
|
| 6 | 17 |
20.5%
|
|
| 7 | 20 |
24.1%
|
|
| 8 | 11 |
13.3%
|
|
| 9 | 13 |
15.7%
|
|
| 10 | Very effective | 5 |
6%
|
| -99 | 8 | ||
| 11 | Don't know | 44 | |
| Sysmiss | 24 |