| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 6 |
2.8%
|
|
| 3 | 10 |
4.7%
|
|
| 4 | 11 |
5.2%
|
|
| 5 | 22 |
10.3%
|
|
| 6 | 27 |
12.7%
|
|
| 7 | 43 |
20.2%
|
|
| 8 | 51 |
23.9%
|
|
| 9 | 30 |
14.1%
|
|
| 10 | Very effective | 12 |
5.6%
|
| -99 | 1 | ||
| 11 | Don't know | 33 | |
| Sysmiss | 13 |