| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 9 |
3.4%
|
| 2 | 9 |
3.4%
|
|
| 3 | 11 |
4.2%
|
|
| 4 | 13 |
4.9%
|
|
| 5 | 33 |
12.5%
|
|
| 6 | 27 |
10.2%
|
|
| 7 | 31 |
11.7%
|
|
| 8 | 31 |
11.7%
|
|
| 9 | 15 |
5.7%
|
|
| 10 | Very effective | 36 |
13.6%
|
| 11 | 49 |
18.6%
|