| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 10 |
5.6%
|
|
| 3 | 10 |
5.6%
|
|
| 4 | 11 |
6.2%
|
|
| 5 | 20 |
11.3%
|
|
| 6 | 26 |
14.7%
|
|
| 7 | 34 |
19.2%
|
|
| 8 | 40 |
22.6%
|
|
| 9 | 21 |
11.9%
|
|
| 10 | Very effective | 4 |
2.3%
|
| -99 | 2 | ||
| 11 | Don't know | 68 | |
| Sysmiss | 13 |