| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 8 |
4.6%
|
| 2 | 4 |
2.3%
|
|
| 3 | 3 |
1.7%
|
|
| 4 | 7 |
4%
|
|
| 5 | 16 |
9.1%
|
|
| 6 | 17 |
9.7%
|
|
| 7 | 20 |
11.4%
|
|
| 8 | 30 |
17.1%
|
|
| 9 | 18 |
10.3%
|
|
| 10 | Very effective | 43 |
24.6%
|
| 11 | Don't know | 9 |
5.1%
|