| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.2%
|
| 2 | 2 |
2.3%
|
|
| 3 | 3 |
3.5%
|
|
| 4 | 4 |
4.7%
|
|
| 5 | 9 |
10.5%
|
|
| 6 | 11 |
12.8%
|
|
| 7 | 14 |
16.3%
|
|
| 8 | 16 |
18.6%
|
|
| 9 | 10 |
11.6%
|
|
| 10 | Very effective | 16 |
18.6%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 80 |