| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 - Not effective at all | 4 |
1.6%
|
| 2 | 2 | 1 |
0.4%
|
| 3 | 3 | 5 |
1.9%
|
| 4 | 4 | 9 |
3.5%
|
| 5 | 5 | 14 |
5.4%
|
| 6 | 6 | 15 |
5.8%
|
| 7 | 7 | 9 |
3.5%
|
| 8 | 8 | 8 |
3.1%
|
| 9 | 9 | 4 |
1.6%
|
| 10 | 10 - Very effective | 4 |
1.6%
|
| 11 | Don't know | 185 |
71.7%
|