| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
0.5%
|
| 2 | 13 |
2.1%
|
|
| 3 | 19 |
3.1%
|
|
| 4 | 28 |
4.6%
|
|
| 5 | 52 |
8.6%
|
|
| 6 | 42 |
6.9%
|
|
| 7 | 63 |
10.4%
|
|
| 8 | 65 |
10.7%
|
|
| 9 | 47 |
7.8%
|
|
| 10 | Very effective | 31 |
5.1%
|
| 11 | Don't know | 198 |
32.7%
|
| Sysmiss | 45 |
7.4%
|