| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.7%
|
|
| 1 | Not effective at all | 2 |
1.5%
|
| 2 | 1 |
0.7%
|
|
| 3 | 6 |
4.5%
|
|
| 4 | 4 |
3%
|
|
| 5 | 26 |
19.4%
|
|
| 6 | 18 |
13.4%
|
|
| 7 | 15 |
11.2%
|
|
| 8 | 10 |
7.5%
|
|
| 9 | 7 |
5.2%
|
|
| 10 | Very effective | 8 |
6%
|
| 11 | Don't know | 36 |
26.9%
|