| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 4 |
2.3%
|
|
| 3 | 4 |
2.3%
|
|
| 4 | 7 |
4%
|
|
| 5 | 19 |
10.9%
|
|
| 6 | 18 |
10.3%
|
|
| 7 | 40 |
22.9%
|
|
| 8 | 37 |
21.1%
|
|
| 9 | 21 |
12%
|
|
| 10 | Very effective | 7 |
4%
|
| 11 | Don't know | 17 |
9.7%
|