| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 |
1.3%
|
| 2 | 3 |
1.3%
|
|
| 3 | 5 |
2.2%
|
|
| 4 | 5 |
2.2%
|
|
| 5 | 15 |
6.7%
|
|
| 6 | 13 |
5.8%
|
|
| 7 | 22 |
9.8%
|
|
| 8 | 38 |
16.9%
|
|
| 9 | 44 |
19.6%
|
|
| 10 | Very effective | 77 |
34.2%
|
| -99 | 9 | ||
| 11 | Don't know | 68 | |
| Sysmiss | 50 |