| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 6 |
2.7%
|
|
| 3 | 15 |
6.8%
|
|
| 4 | 9 |
4.1%
|
|
| 5 | 19 |
8.6%
|
|
| 6 | 31 |
14%
|
|
| 7 | 42 |
18.9%
|
|
| 8 | 51 |
23%
|
|
| 9 | 39 |
17.6%
|
|
| 10 | Very effective | 9 |
4.1%
|
| -99 | 1 | ||
| 11 | Don't know | 26 | |
| Sysmiss | 11 |