| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 2 |
0.7%
|
|
| 3 | 21 |
7.5%
|
|
| 4 | 20 |
7.2%
|
|
| 5 | 57 |
20.4%
|
|
| 6 | 37 |
13.3%
|
|
| 7 | 48 |
17.2%
|
|
| 8 | 45 |
16.1%
|
|
| 9 | 22 |
7.9%
|
|
| 10 | Very effective | 26 |
9.3%
|
| 11 | Don't know | 31 | |
| Sysmiss | 86 |