| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 |
1.7%
|
| 2 | 2 |
0.9%
|
|
| 3 | 8 |
3.4%
|
|
| 4 | 5 |
2.1%
|
|
| 5 | 16 |
6.8%
|
|
| 6 | 16 |
6.8%
|
|
| 7 | 35 |
14.9%
|
|
| 8 | 39 |
16.6%
|
|
| 9 | 38 |
16.2%
|
|
| 10 | Very effective | 72 |
30.6%
|
| -99 | 10 | ||
| 11 | Don't know | 55 | |
| Sysmiss | 52 |