| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.7%
|
| 2 | 2 |
1.5%
|
|
| 3 | 2 |
1.5%
|
|
| 4 | 7 |
5.1%
|
|
| 5 | 12 |
8.8%
|
|
| 6 | 18 |
13.2%
|
|
| 7 | 41 |
30.1%
|
|
| 8 | 33 |
24.3%
|
|
| 9 | 17 |
12.5%
|
|
| 10 | Very effective | 3 |
2.2%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 158 |