| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 1 |
0.4%
|
|
| 3 | 5 |
2%
|
|
| 4 | 4 |
1.6%
|
|
| 5 | 12 |
4.7%
|
|
| 6 | 21 |
8.3%
|
|
| 7 | 24 |
9.5%
|
|
| 8 | 41 |
16.2%
|
|
| 9 | 37 |
14.6%
|
|
| 10 | Very effective | 107 |
42.3%
|
| -99 | 8 | ||
| 11 | Don't know | 38 | |
| Sysmiss | 53 |