| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 |
1.7%
|
| 2 | 2 |
0.9%
|
|
| 3 | 5 |
2.2%
|
|
| 4 | 9 |
3.9%
|
|
| 5 | 17 |
7.4%
|
|
| 6 | 18 |
7.8%
|
|
| 7 | 24 |
10.4%
|
|
| 8 | 32 |
13.9%
|
|
| 9 | 37 |
16.1%
|
|
| 10 | Very effective | 82 |
35.7%
|
| -99 | 13 | ||
| 11 | Don't know | 58 | |
| Sysmiss | 51 |