| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
2.5%
|
| 3 | 5 |
4.1%
|
|
| 5 | 13 |
10.7%
|
|
| 6 | 9 |
7.4%
|
|
| 7 | 11 |
9.1%
|
|
| 8 | 13 |
10.7%
|
|
| 9 | 15 |
12.4%
|
|
| 10 | Very effective | 7 |
5.8%
|
| 11 | Don't know | 45 |
37.2%
|