| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.9%
|
| 2 | 1 |
0.4%
|
|
| 3 | 2 |
0.9%
|
|
| 4 | 6 |
2.7%
|
|
| 5 | 13 |
5.8%
|
|
| 6 | 15 |
6.7%
|
|
| 7 | 23 |
10.2%
|
|
| 8 | 23 |
10.2%
|
|
| 9 | 28 |
12.4%
|
|
| 10 | Very effective | 13 |
5.8%
|
| 11 | Don't know | 99 |
44%
|
| Sysmiss | 10 |