| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.6%
|
| 2 | 2 |
3.3%
|
|
| 3 | 1 |
1.6%
|
|
| 4 | 4 |
6.6%
|
|
| 5 | 8 |
13.1%
|
|
| 6 | 10 |
16.4%
|
|
| 7 | 9 |
14.8%
|
|
| 8 | 13 |
21.3%
|
|
| 9 | 7 |
11.5%
|
|
| 10 | Very effective | 6 |
9.8%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 77 |