| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 4 |
2.3%
|
|
| 3 | 2 |
1.1%
|
|
| 4 | 10 |
5.7%
|
|
| 5 | 24 |
13.7%
|
|
| 6 | 28 |
16%
|
|
| 7 | 32 |
18.3%
|
|
| 8 | 28 |
16%
|
|
| 9 | 15 |
8.6%
|
|
| 10 | Very effective | 8 |
4.6%
|
| 11 | Don't know | 23 |
13.1%
|