| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
0.7%
|
| 2 | 5 |
1.1%
|
|
| 3 | 6 |
1.4%
|
|
| 4 | 12 |
2.8%
|
|
| 5 | 27 |
6.2%
|
|
| 6 | 34 |
7.8%
|
|
| 7 | 43 |
9.9%
|
|
| 8 | 50 |
11.5%
|
|
| 9 | 39 |
8.9%
|
|
| 10 | Very effective | 111 |
25.5%
|
| 11 | Don't know | 106 |
24.3%
|
| Sysmiss | 131 |