| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 6 |
2.7%
|
| 2 | 2 |
0.9%
|
|
| 3 | 5 |
2.2%
|
|
| 4 | 5 |
2.2%
|
|
| 5 | 17 |
7.6%
|
|
| 6 | 28 |
12.4%
|
|
| 7 | 37 |
16.4%
|
|
| 8 | 45 |
20%
|
|
| 9 | 23 |
10.2%
|
|
| 10 | Very effective | 16 |
7.1%
|
| 11 | Don't know | 41 |
18.2%
|