| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.9%
|
| 2 | 5 |
2.3%
|
|
| 3 | 7 |
3.2%
|
|
| 4 | 3 |
1.4%
|
|
| 5 | 21 |
9.5%
|
|
| 6 | 27 |
12.3%
|
|
| 7 | 35 |
15.9%
|
|
| 8 | 39 |
17.7%
|
|
| 9 | 21 |
9.5%
|
|
| 10 | Very effective | 23 |
10.5%
|
| 11 | Don't know | 37 |
16.8%
|