| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.5%
|
| 2 | 8 |
1.8%
|
|
| 3 | 4 |
0.9%
|
|
| 4 | 15 |
3.4%
|
|
| 5 | 40 |
9%
|
|
| 6 | 25 |
5.6%
|
|
| 7 | 47 |
10.6%
|
|
| 8 | 53 |
12%
|
|
| 9 | 41 |
9.3%
|
|
| 10 | Very effective | 80 |
18.1%
|
| 11 | Don't know | 128 |
28.9%
|
| Sysmiss | 124 |