| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.3%
|
| 2 | 2 |
0.5%
|
|
| 3 | 4 |
1.1%
|
|
| 4 | 22 |
5.9%
|
|
| 5 | 54 |
14.6%
|
|
| 6 | 82 |
22.1%
|
|
| 7 | 70 |
18.9%
|
|
| 8 | 57 |
15.4%
|
|
| 9 | 43 |
11.6%
|
|
| 10 | Very effective | 36 |
9.7%
|
| 11 | Don't know | 31 | |
| Sysmiss | 21 |