| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 5 |
1.8%
|
| 2 | 2 |
0.7%
|
|
| 3 | 6 |
2.1%
|
|
| 4 | 13 |
4.6%
|
|
| 5 | 27 |
9.5%
|
|
| 6 | 26 |
9.1%
|
|
| 7 | 18 |
6.3%
|
|
| 8 | 15 |
5.3%
|
|
| 9 | 9 |
3.2%
|
|
| 10 | Very effective | 10 |
3.5%
|
| 11 | Don't know | 154 |
54%
|
| Sysmiss | 18 |