| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 3 |
1.7%
|
|
| 3 | 2 |
1.1%
|
|
| 4 | 12 |
6.9%
|
|
| 5 | 25 |
14.3%
|
|
| 6 | 27 |
15.4%
|
|
| 7 | 33 |
18.9%
|
|
| 8 | 24 |
13.7%
|
|
| 9 | 21 |
12%
|
|
| 10 | Very effective | 5 |
2.9%
|
| 11 | Don't know | 22 |
12.6%
|