| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 1 |
0.4%
|
|
| 3 | 4 |
1.8%
|
|
| 4 | 7 |
3.1%
|
|
| 5 | 9 |
4%
|
|
| 6 | 12 |
5.3%
|
|
| 7 | 22 |
9.8%
|
|
| 8 | 34 |
15.1%
|
|
| 9 | 37 |
16.4%
|
|
| 10 | Very effective | 98 |
43.6%
|
| -99 | 15 | ||
| 11 | Don't know | 60 | |
| Sysmiss | 52 |