| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.7%
|
| 2 | 2 |
3.4%
|
|
| 3 | 1 |
1.7%
|
|
| 4 | 1 |
1.7%
|
|
| 5 | 12 |
20.7%
|
|
| 6 | 7 |
12.1%
|
|
| 7 | 14 |
24.1%
|
|
| 8 | 8 |
13.8%
|
|
| 9 | 8 |
13.8%
|
|
| 10 | Very effective | 4 |
6.9%
|
| -99 | 3 | ||
| 11 | Don't know | 30 | |
| Sysmiss | 18 |