| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.5%
|
| 2 | 3 |
4.5%
|
|
| 3 | 4 |
6.1%
|
|
| 4 | 1 |
1.5%
|
|
| 5 | 10 |
15.2%
|
|
| 6 | 9 |
13.6%
|
|
| 7 | 14 |
21.2%
|
|
| 8 | 10 |
15.2%
|
|
| 9 | 9 |
13.6%
|
|
| 10 | Very effective | 5 |
7.6%
|
| -99 | 14 | ||
| 11 | Don't know | 87 | |
| Sysmiss | 16 |