| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.6%
|
| 2 | 5 |
2.9%
|
|
| 3 | 14 |
8.2%
|
|
| 4 | 9 |
5.3%
|
|
| 5 | 9 |
5.3%
|
|
| 6 | 20 |
11.7%
|
|
| 7 | 29 |
17%
|
|
| 8 | 41 |
24%
|
|
| 9 | 28 |
16.4%
|
|
| 10 | Very effective | 15 |
8.8%
|
| 11 | Don't know | 0 |
0%
|
| Sysmiss | 222 |