| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.5%
|
|
| 1 | Not effective at all | 2 |
0.9%
|
| 2 | 1 |
0.5%
|
|
| 3 | 10 |
4.7%
|
|
| 4 | 3 |
1.4%
|
|
| 5 | 15 |
7%
|
|
| 6 | 19 |
8.9%
|
|
| 7 | 19 |
8.9%
|
|
| 8 | 36 |
16.8%
|
|
| 9 | 21 |
9.8%
|
|
| 10 | Very effective | 20 |
9.3%
|
| 11 | Don't know | 67 |
31.3%
|
| Sysmiss | 6 |