| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.7%
|
| 2 | 5 |
1.7%
|
|
| 3 | 13 |
4.4%
|
|
| 4 | 27 |
9.1%
|
|
| 5 | 38 |
12.8%
|
|
| 6 | 50 |
16.8%
|
|
| 7 | 64 |
21.5%
|
|
| 8 | 52 |
17.4%
|
|
| 9 | 34 |
11.4%
|
|
| 10 | Very effective | 13 |
4.4%
|
| 11 | Don't know | 55 | |
| Sysmiss | 13 |