| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.3%
|
|
| 1 | Not effective at all | 5 |
1.5%
|
| 2 | 8 |
2.3%
|
|
| 3 | 16 |
4.7%
|
|
| 4 | 11 |
3.2%
|
|
| 5 | 30 |
8.8%
|
|
| 6 | 38 |
11.1%
|
|
| 7 | 33 |
9.7%
|
|
| 8 | 27 |
7.9%
|
|
| 9 | 8 |
2.3%
|
|
| 10 | Very effective | 17 |
5%
|
| 11 | Don't know | 147 |
43.1%
|
| Sysmiss | 13 |