| Value | Category | Cases | |
|---|---|---|---|
| -99 | 2 |
1.5%
|
|
| 1 | Not effective at all | 4 |
3%
|
| 2 | 2 |
1.5%
|
|
| 3 | 5 |
3.7%
|
|
| 4 | 5 |
3.7%
|
|
| 5 | 13 |
9.7%
|
|
| 6 | 22 |
16.4%
|
|
| 7 | 24 |
17.9%
|
|
| 8 | 16 |
11.9%
|
|
| 9 | 4 |
3%
|
|
| 10 | Very effective | 9 |
6.7%
|
| 11 | Don't know | 28 |
20.9%
|