| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.8%
|
| 2 | 7 |
2.7%
|
|
| 3 | 15 |
5.8%
|
|
| 4 | 21 |
8.1%
|
|
| 5 | 42 |
16.3%
|
|
| 6 | 53 |
20.5%
|
|
| 7 | 46 |
17.8%
|
|
| 8 | 41 |
15.9%
|
|
| 9 | 18 |
7%
|
|
| 10 | Very effective | 13 |
5%
|
| -99 | 2 | ||
| 11 | Don't know | 100 | |
| Sysmiss | 61 |