| Value | Category | Cases | |
|---|---|---|---|
| -99 | 2 |
1.3%
|
|
| 1 | Not effective at all | 2 |
1.3%
|
| 2 | 2 |
1.3%
|
|
| 3 | 4 |
2.6%
|
|
| 4 | 12 |
7.9%
|
|
| 5 | 16 |
10.5%
|
|
| 6 | 18 |
11.8%
|
|
| 7 | 19 |
12.5%
|
|
| 8 | 14 |
9.2%
|
|
| 9 | 7 |
4.6%
|
|
| 10 | Very effective | 16 |
10.5%
|
| 11 | Don't know | 40 |
26.3%
|