| Value | Category | Cases | |
|---|---|---|---|
| -99 | 2 |
1.5%
|
|
| 1 | Not effective at all | 3 |
2.2%
|
| 2 | 1 |
0.7%
|
|
| 3 | 4 |
3%
|
|
| 4 | 10 |
7.5%
|
|
| 5 | 16 |
11.9%
|
|
| 6 | 19 |
14.2%
|
|
| 7 | 27 |
20.1%
|
|
| 8 | 15 |
11.2%
|
|
| 9 | 7 |
5.2%
|
|
| 10 | Very effective | 6 |
4.5%
|
| 11 | Don't know | 24 |
17.9%
|