| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
1.8%
|
| 2 | 2 |
1.8%
|
|
| 3 | 4 |
3.6%
|
|
| 4 | 6 |
5.4%
|
|
| 5 | 13 |
11.6%
|
|
| 6 | 12 |
10.7%
|
|
| 7 | 20 |
17.9%
|
|
| 8 | 31 |
27.7%
|
|
| 9 | 14 |
12.5%
|
|
| 10 | Very effective | 6 |
5.4%
|
| 11 | Don't know | 2 |
1.8%
|