| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.4%
|
| 2 | 1 |
0.4%
|
|
| 3 | 5 |
2.1%
|
|
| 4 | 6 |
2.6%
|
|
| 5 | 16 |
6.8%
|
|
| 6 | 13 |
5.5%
|
|
| 7 | 27 |
11.5%
|
|
| 8 | 32 |
13.6%
|
|
| 9 | 39 |
16.6%
|
|
| 10 | Very effective | 95 |
40.4%
|
| -99 | 9 | ||
| 11 | Don't know | 59 | |
| Sysmiss | 49 |