| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 3 |
1.5%
|
|
| 3 | 3 |
1.5%
|
|
| 4 | 3 |
1.5%
|
|
| 5 | 11 |
5.4%
|
|
| 6 | 13 |
6.4%
|
|
| 7 | 26 |
12.8%
|
|
| 8 | 27 |
13.3%
|
|
| 9 | 21 |
10.3%
|
|
| 10 | Very effective | 25 |
12.3%
|
| 11 | Don't know | 70 |
34.5%
|
| Sysmiss | 23 |