| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.7%
|
| 2 | 4 |
1.4%
|
|
| 3 | 13 |
4.6%
|
|
| 4 | 25 |
8.9%
|
|
| 5 | 32 |
11.3%
|
|
| 6 | 57 |
20.2%
|
|
| 7 | 59 |
20.9%
|
|
| 8 | 58 |
20.6%
|
|
| 9 | 24 |
8.5%
|
|
| 10 | Very effective | 8 |
2.8%
|
| 11 | Don't know | 73 | |
| Sysmiss | 11 |