| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.7%
|
| 2 | 1 |
0.7%
|
|
| 3 | 2 |
1.5%
|
|
| 4 | 7 |
5.2%
|
|
| 5 | 20 |
14.9%
|
|
| 6 | 13 |
9.7%
|
|
| 7 | 28 |
20.9%
|
|
| 8 | 14 |
10.4%
|
|
| 9 | 1 |
0.7%
|
|
| 10 | Very effective | 7 |
5.2%
|
| 11 | Don't know | 40 |
29.9%
|