| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.5%
|
| 2 | 5 |
2.4%
|
|
| 3 | 3 |
1.4%
|
|
| 4 | 5 |
2.4%
|
|
| 5 | 14 |
6.6%
|
|
| 6 | 18 |
8.5%
|
|
| 7 | 23 |
10.9%
|
|
| 8 | 35 |
16.6%
|
|
| 9 | 34 |
16.1%
|
|
| 10 | Very effective | 73 |
34.6%
|
| -99 | 11 | ||
| 11 | Don't know | 81 | |
| Sysmiss | 49 |