| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 2 |
0.9%
|
|
| 3 | 1 |
0.5%
|
|
| 4 | 3 |
1.4%
|
|
| 5 | 18 |
8.3%
|
|
| 6 | 16 |
7.3%
|
|
| 7 | 59 |
27.1%
|
|
| 8 | 77 |
35.3%
|
|
| 9 | 37 |
17%
|
|
| 10 | Very effective | 4 |
1.8%
|
| 11 | Don't know | 127 | |
| Sysmiss | 15 |