| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.7%
|
| 2 | 4 |
1.4%
|
|
| 3 | 6 |
2.1%
|
|
| 4 | 6 |
2.1%
|
|
| 5 | 17 |
5.8%
|
|
| 6 | 20 |
6.8%
|
|
| 7 | 40 |
13.7%
|
|
| 8 | 32 |
11%
|
|
| 9 | 45 |
15.4%
|
|
| 10 | Very effective | 52 |
17.8%
|
| 11 | Don't know | 68 |
23.3%
|
| Sysmiss | 146 |