| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 |
3.9%
|
|
| 1 | Not effective at all | 4 |
2.6%
|
| 2 | 1 |
0.7%
|
|
| 3 | 5 |
3.3%
|
|
| 4 | 11 |
7.2%
|
|
| 5 | 14 |
9.2%
|
|
| 6 | 12 |
7.9%
|
|
| 7 | 18 |
11.8%
|
|
| 8 | 10 |
6.6%
|
|
| 9 | 12 |
7.9%
|
|
| 10 | Very effective | 16 |
10.5%
|
| 11 | Don't know | 43 |
28.3%
|