| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
0.3%
|
| 2 | 6 |
1.7%
|
|
| 3 | 8 |
2.2%
|
|
| 4 | 28 |
7.9%
|
|
| 5 | 62 |
17.4%
|
|
| 6 | 69 |
19.4%
|
|
| 7 | 72 |
20.2%
|
|
| 8 | 48 |
13.5%
|
|
| 9 | 28 |
7.9%
|
|
| 10 | Very effective | 34 |
9.6%
|
| 11 | Don't know | 12 | |
| Sysmiss | 28 |