| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.5%
|
| 2 | 1 |
1.5%
|
|
| 3 | 4 |
5.9%
|
|
| 4 | 7 |
10.3%
|
|
| 5 | 10 |
14.7%
|
|
| 6 | 8 |
11.8%
|
|
| 7 | 14 |
20.6%
|
|
| 8 | 10 |
14.7%
|
|
| 9 | 7 |
10.3%
|
|
| 10 | Very effective | 6 |
8.8%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 138 |