| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.3%
|
| 2 | 1 |
0.3%
|
|
| 3 | 15 |
4.9%
|
|
| 4 | 14 |
4.6%
|
|
| 5 | 41 |
13.4%
|
|
| 6 | 45 |
14.8%
|
|
| 7 | 26 |
8.5%
|
|
| 8 | 28 |
9.2%
|
|
| 9 | 10 |
3.3%
|
|
| 10 | Very effective | 2 |
0.7%
|
| 11 | Don't know | 122 |
40%
|
| Sysmiss | 63 |