| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.3%
|
| 3 | 3 |
0.8%
|
|
| 4 | 9 |
2.5%
|
|
| 5 | 41 |
11.3%
|
|
| 6 | 56 |
15.4%
|
|
| 7 | 88 |
24.2%
|
|
| 8 | 73 |
20.1%
|
|
| 9 | 42 |
11.6%
|
|
| 10 | Very effective | 50 |
13.8%
|
| 11 | Don't know | 35 | |
| Sysmiss | 25 |