| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.3%
|
| 2 | 1 |
0.3%
|
|
| 3 | 5 |
1.3%
|
|
| 4 | 6 |
1.6%
|
|
| 5 | 17 |
4.4%
|
|
| 6 | 21 |
5.4%
|
|
| 7 | 78 |
20.2%
|
|
| 8 | 127 |
32.8%
|
|
| 9 | 76 |
19.6%
|
|
| 10 | Very effective | 55 |
14.2%
|
| -99 | 21 | ||
| 11 | Don't know | 134 | |
| Sysmiss | 38 |