| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 3 |
1.1%
|
|
| 3 | 5 |
1.8%
|
|
| 4 | 17 |
6.1%
|
|
| 5 | 42 |
15%
|
|
| 6 | 68 |
24.3%
|
|
| 7 | 64 |
22.9%
|
|
| 8 | 41 |
14.6%
|
|
| 9 | 26 |
9.3%
|
|
| 10 | Very effective | 13 |
4.6%
|
| 11 | Don't know | 68 | |
| Sysmiss | 73 |