| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.6%
|
| 2 | 3 |
0.8%
|
|
| 3 | 5 |
1.4%
|
|
| 4 | 25 |
6.9%
|
|
| 5 | 34 |
9.4%
|
|
| 6 | 60 |
16.6%
|
|
| 7 | 63 |
17.4%
|
|
| 8 | 71 |
19.6%
|
|
| 9 | 45 |
12.4%
|
|
| 10 | Very effective | 54 |
14.9%
|
| -99 | 68 | ||
| 11 | Don't know | 76 | |
| Sysmiss | 151 |