| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 3 | 6 |
2.6%
|
|
| 4 | 3 |
1.3%
|
|
| 5 | 33 |
14.2%
|
|
| 6 | 40 |
17.2%
|
|
| 7 | 49 |
21%
|
|
| 8 | 57 |
24.5%
|
|
| 9 | 25 |
10.7%
|
|
| 10 | Very effective | 19 |
8.2%
|
| -99 | 24 | ||
| 11 | Don't know | 285 | |
| Sysmiss | 38 |