| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.8%
|
| 2 | 1 |
1.8%
|
|
| 3 | 4 |
7.1%
|
|
| 4 | 6 |
10.7%
|
|
| 5 | 12 |
21.4%
|
|
| 6 | 5 |
8.9%
|
|
| 7 | 11 |
19.6%
|
|
| 8 | 7 |
12.5%
|
|
| 9 | 5 |
8.9%
|
|
| 10 | Very effective | 4 |
7.1%
|
| -99 | 7 | ||
| 11 | Don't know | 72 | |
| Sysmiss | 24 |