| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 5 |
1.8%
|
|
| 3 | 10 |
3.6%
|
|
| 4 | 17 |
6.2%
|
|
| 5 | 39 |
14.1%
|
|
| 6 | 67 |
24.3%
|
|
| 7 | 54 |
19.6%
|
|
| 8 | 44 |
15.9%
|
|
| 9 | 28 |
10.1%
|
|
| 10 | Very effective | 11 |
4%
|
| -99 | 2 | ||
| 11 | Don't know | 83 | |
| Sysmiss | 60 |