| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 2 |
1.1%
|
|
| 3 | 3 |
1.7%
|
|
| 4 | 4 |
2.3%
|
|
| 5 | 5 |
2.8%
|
|
| 6 | 4 |
2.3%
|
|
| 7 | 6 |
3.4%
|
|
| 8 | 24 |
13.6%
|
|
| 9 | 11 |
6.2%
|
|
| 10 | Very effective | 15 |
8.5%
|
| 11 | Don't know | 0 |
0%
|
| NA | 102 |
57.6%
|