| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.3%
|
| 2 | 5 |
0.8%
|
|
| 3 | 11 |
1.8%
|
|
| 4 | 27 |
4.5%
|
|
| 5 | 47 |
7.8%
|
|
| 6 | 41 |
6.8%
|
|
| 7 | 64 |
10.6%
|
|
| 8 | 71 |
11.7%
|
|
| 9 | 50 |
8.3%
|
|
| 10 | Very effective | 61 |
10.1%
|
| 11 | Don't know | 175 |
28.9%
|
| Sysmiss | 52 |
8.6%
|