| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 1 |
0.6%
|
|
| 3 | 3 |
1.8%
|
|
| 4 | 8 |
4.8%
|
|
| 5 | 14 |
8.5%
|
|
| 6 | 26 |
15.8%
|
|
| 7 | 30 |
18.2%
|
|
| 8 | 41 |
24.8%
|
|
| 9 | 14 |
8.5%
|
|
| 10 | Very effective | 27 |
16.4%
|
| 11 | Don't know | 4 | |
| 12 | 52 | ||
| Sysmiss | 32 |