| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 13 |
2.5%
|
| 2 | 8 |
1.5%
|
|
| 3 | 17 |
3.2%
|
|
| 4 | 38 |
7.3%
|
|
| 5 | 74 |
14.1%
|
|
| 6 | 91 |
17.4%
|
|
| 7 | 93 |
17.7%
|
|
| 8 | 73 |
13.9%
|
|
| 9 | 50 |
9.5%
|
|
| 10 | Very effective | 67 |
12.8%
|
| 11 | Don't know | 134 | |
| Sysmiss | 61 |