| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 6 |
3.8%
|
|
| 3 | 9 |
5.8%
|
|
| 4 | 19 |
12.2%
|
|
| 5 | 26 |
16.7%
|
|
| 6 | 35 |
22.4%
|
|
| 7 | 29 |
18.6%
|
|
| 8 | 15 |
9.6%
|
|
| 9 | 10 |
6.4%
|
|
| 10 | Very effective | 6 |
3.8%
|
| 11 | Don't know | 13 | |
| Sysmiss | 34 |