| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.8%
|
| 2 | 1 |
0.8%
|
|
| 3 | 3 |
2.5%
|
|
| 4 | 4 |
3.3%
|
|
| 5 | 11 |
9.1%
|
|
| 6 | 12 |
9.9%
|
|
| 7 | 15 |
12.4%
|
|
| 8 | 18 |
14.9%
|
|
| 9 | 12 |
9.9%
|
|
| 10 | Very effective | 15 |
12.4%
|
| 11 | Don't know | 29 |
24%
|