| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 0 |
0%
|
| 3 | 2 |
1.3%
|
|
| 4 | 2 |
1.3%
|
|
| 5 | 8 |
5.2%
|
|
| 6 | 9 |
5.9%
|
|
| 7 | 21 |
13.7%
|
|
| 8 | 53 |
34.6%
|
|
| 9 | 39 |
25.5%
|
|
| 10 | Very effective | 19 |
12.4%
|
| -99 | 2 | ||
| 11 | Don't know | 2 |