| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 |
0.9%
|
| 2 | 6 |
1.4%
|
|
| 3 | 6 |
1.4%
|
|
| 4 | 10 |
2.3%
|
|
| 5 | 21 |
4.8%
|
|
| 6 | 38 |
8.6%
|
|
| 7 | 50 |
11.3%
|
|
| 8 | 59 |
13.3%
|
|
| 9 | 39 |
8.8%
|
|
| 10 | Very effective | 109 |
24.7%
|
| 11 | Don't know | 100 |
22.6%
|
| Sysmiss | 125 |