| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.2%
|
| 2 | 3 |
0.7%
|
|
| 3 | 3 |
0.7%
|
|
| 4 | 5 |
1.2%
|
|
| 5 | 18 |
4.3%
|
|
| 6 | 30 |
7.2%
|
|
| 7 | 76 |
18.2%
|
|
| 8 | 126 |
30.2%
|
|
| 9 | 76 |
18.2%
|
|
| 10 | Very effective | 79 |
18.9%
|
| -99 | 17 | ||
| 11 | Don't know | 108 | |
| Sysmiss | 38 |