| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 16 |
10.4%
|
| 10 | Very effective | 2 |
1.3%
|
| 11 | Don't know | 59 |
38.3%
|
| -99 | 1 |
0.6%
|
|
| 2 | 13 |
8.4%
|
|
| 3 | 14 |
9.1%
|
|
| 4 | 16 |
10.4%
|
|
| 5 | 12 |
7.8%
|
|
| 6 | 13 |
8.4%
|
|
| 7 | 1 |
0.6%
|
|
| 8 | 5 |
3.2%
|
|
| 9 | 2 |
1.3%
|
|
| Sysmiss | 11 |