| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.5%
|
|
| 1 | Not effective at all | 5 |
2.4%
|
| 2 | 5 |
2.4%
|
|
| 3 | 11 |
5.3%
|
|
| 4 | 11 |
5.3%
|
|
| 5 | 33 |
15.9%
|
|
| 6 | 30 |
14.4%
|
|
| 7 | 31 |
14.9%
|
|
| 8 | 29 |
13.9%
|
|
| 9 | 8 |
3.8%
|
|
| 10 | Very effective | 3 |
1.4%
|
| 11 | N/A | 3 |
1.4%
|
| 12 | Don't know | 38 |
18.3%
|
| Sysmiss | 17 |