| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.5%
|
|
| 1 | Not effective at all | 8 |
3.8%
|
| 2 | 2 |
0.9%
|
|
| 3 | 2 |
0.9%
|
|
| 4 | 8 |
3.8%
|
|
| 5 | 16 |
7.6%
|
|
| 6 | 23 |
10.9%
|
|
| 7 | 30 |
14.2%
|
|
| 8 | 37 |
17.5%
|
|
| 9 | 20 |
9.5%
|
|
| 10 | Very effective | 24 |
11.4%
|
| 11 | N/A | 13 |
6.2%
|
| 12 | Don't know | 27 |
12.8%
|
| Sysmiss | 14 |