| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.8%
|
| 2 | 2 |
1.6%
|
|
| 3 | 8 |
6.3%
|
|
| 4 | 12 |
9.4%
|
|
| 5 | 13 |
10.2%
|
|
| 6 | 22 |
17.3%
|
|
| 7 | 19 |
15%
|
|
| 8 | 12 |
9.4%
|
|
| 9 | 26 |
20.5%
|
|
| 10 | Very effective | 12 |
9.4%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 39 |