| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.3%
|
| 2 | 3 |
3.9%
|
|
| 3 | 3 |
3.9%
|
|
| 4 | 6 |
7.8%
|
|
| 5 | 9 |
11.7%
|
|
| 6 | 11 |
14.3%
|
|
| 7 | 15 |
19.5%
|
|
| 8 | 15 |
19.5%
|
|
| 9 | 12 |
15.6%
|
|
| 10 | Very effective | 2 |
2.6%
|
| -99 | 7 | ||
| 11 | Don't know | 51 | |
| Sysmiss | 24 |