| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 3 |
1.3%
|
|
| 3 | 1 |
0.4%
|
|
| 4 | 7 |
3.1%
|
|
| 5 | 11 |
4.9%
|
|
| 6 | 11 |
4.9%
|
|
| 7 | 18 |
8%
|
|
| 8 | 36 |
16%
|
|
| 9 | 27 |
12%
|
|
| 10 | Very effective | 15 |
6.7%
|
| 11 | Don't know | 95 |
42.2%
|
| Sysmiss | 10 |