| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.6%
|
| 2 | 3 |
0.9%
|
|
| 3 | 9 |
2.8%
|
|
| 4 | 12 |
3.7%
|
|
| 5 | 31 |
9.6%
|
|
| 6 | 57 |
17.7%
|
|
| 7 | 60 |
18.6%
|
|
| 8 | 79 |
24.5%
|
|
| 9 | 45 |
14%
|
|
| 10 | Very effective | 24 |
7.5%
|
| -99 | 71 | ||
| 11 | Don't know | 108 | |
| Sysmiss | 156 |