| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.5%
|
| 2 | 2 |
1.5%
|
|
| 3 | 5 |
3.7%
|
|
| 4 | 4 |
3%
|
|
| 5 | 19 |
14.2%
|
|
| 6 | 15 |
11.2%
|
|
| 7 | 17 |
12.7%
|
|
| 8 | 32 |
23.9%
|
|
| 9 | 9 |
6.7%
|
|
| 10 | Very effective | 9 |
6.7%
|
| 11 | Don't know | 20 |
14.9%
|