| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.8%
|
| 2 | 2 |
0.8%
|
|
| 3 | 6 |
2.5%
|
|
| 4 | 4 |
1.7%
|
|
| 5 | 14 |
5.8%
|
|
| 6 | 14 |
5.8%
|
|
| 7 | 28 |
11.6%
|
|
| 8 | 26 |
10.8%
|
|
| 9 | 43 |
17.8%
|
|
| 10 | Very effective | 102 |
42.3%
|
| -99 | 10 | ||
| 11 | Don't know | 52 | |
| Sysmiss | 49 |