| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 2 |
0.7%
|
|
| 3 | 4 |
1.4%
|
|
| 4 | 16 |
5.6%
|
|
| 5 | 48 |
16.8%
|
|
| 6 | 33 |
11.6%
|
|
| 7 | 64 |
22.5%
|
|
| 8 | 65 |
22.8%
|
|
| 9 | 23 |
8.1%
|
|
| 10 | Very effective | 29 |
10.2%
|
| 11 | Don't know | 21 |