| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 2 |
1.2%
|
|
| 3 | 3 |
1.8%
|
|
| 4 | 12 |
7.2%
|
|
| 5 | 16 |
9.6%
|
|
| 6 | 28 |
16.9%
|
|
| 7 | 31 |
18.7%
|
|
| 8 | 36 |
21.7%
|
|
| 9 | 24 |
14.5%
|
|
| 10 | Very effective | 13 |
7.8%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 84 |