| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.7%
|
|
| 1 | Not effective at all | 3 |
2.2%
|
| 2 | 3 |
2.2%
|
|
| 3 | 5 |
3.7%
|
|
| 4 | 7 |
5.2%
|
|
| 5 | 26 |
19.4%
|
|
| 6 | 15 |
11.2%
|
|
| 7 | 14 |
10.4%
|
|
| 8 | 12 |
9%
|
|
| 9 | 3 |
2.2%
|
|
| 10 | Very effective | 4 |
3%
|
| 11 | Don't know | 41 |
30.6%
|