| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 1 |
0.5%
|
|
| 3 | 0 |
0%
|
|
| 4 | 2 |
1%
|
|
| 5 | 5 |
2.5%
|
|
| 6 | 12 |
5.9%
|
|
| 7 | 20 |
9.9%
|
|
| 8 | 35 |
17.2%
|
|
| 9 | 32 |
15.8%
|
|
| 10 | Very effective | 50 |
24.6%
|
| 11 | Don't know | 45 |
22.2%
|
| Sysmiss | 23 |