| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.3%
|
| 2 | 1 |
0.3%
|
|
| 3 | 6 |
2%
|
|
| 4 | 5 |
1.6%
|
|
| 5 | 21 |
6.9%
|
|
| 6 | 28 |
9.2%
|
|
| 7 | 79 |
25.9%
|
|
| 8 | 79 |
25.9%
|
|
| 9 | 54 |
17.7%
|
|
| 10 | Very effective | 31 |
10.2%
|
| -99 | 29 | ||
| 11 | Don't know | 207 | |
| Sysmiss | 39 |