| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 |
1.5%
|
| 2 | 6 |
2.2%
|
|
| 3 | 11 |
4%
|
|
| 4 | 17 |
6.2%
|
|
| 5 | 46 |
16.7%
|
|
| 6 | 56 |
20.4%
|
|
| 7 | 47 |
17.1%
|
|
| 8 | 47 |
17.1%
|
|
| 9 | 22 |
8%
|
|
| 10 | Very effective | 19 |
6.9%
|
| 11 | Don't know | 31 |