| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.8%
|
| 2 | 1 |
0.8%
|
|
| 3 | 4 |
3.3%
|
|
| 4 | 3 |
2.5%
|
|
| 5 | 10 |
8.3%
|
|
| 6 | 6 |
5%
|
|
| 7 | 17 |
14%
|
|
| 8 | 12 |
9.9%
|
|
| 9 | 19 |
15.7%
|
|
| 10 | Very effective | 15 |
12.4%
|
| 11 | Don't know | 33 |
27.3%
|