| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 |
0.7%
|
| 2 | 4 |
0.7%
|
|
| 3 | 11 |
1.8%
|
|
| 4 | 13 |
2.1%
|
|
| 5 | 32 |
5.3%
|
|
| 6 | 44 |
7.3%
|
|
| 7 | 70 |
11.6%
|
|
| 8 | 50 |
8.3%
|
|
| 9 | 25 |
4.1%
|
|
| 10 | Very effective | 22 |
3.6%
|
| 11 | Don't know | 289 |
47.7%
|
| Sysmiss | 42 |
6.9%
|