| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 |
1.3%
|
| 2 | 1 |
1.3%
|
|
| 3 | 4 |
5.3%
|
|
| 4 | 6 |
7.9%
|
|
| 5 | 10 |
13.2%
|
|
| 6 | 17 |
22.4%
|
|
| 7 | 15 |
19.7%
|
|
| 8 | 13 |
17.1%
|
|
| 9 | 7 |
9.2%
|
|
| 10 | Very effective | 2 |
2.6%
|
| -99 | 7 | ||
| 11 | Don't know | 52 | |
| Sysmiss | 24 |