| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
1.3%
|
| 2 | 2 |
0.9%
|
|
| 3 | 6 |
2.7%
|
|
| 4 | 11 |
4.9%
|
|
| 5 | 21 |
9.3%
|
|
| 6 | 23 |
10.2%
|
|
| 7 | 20 |
8.8%
|
|
| 8 | 36 |
15.9%
|
|
| 9 | 29 |
12.8%
|
|
| 10 | Very effective | 75 |
33.2%
|
| 11 | Don't know | 45 | |
| Sysmiss | 48 |