| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.7%
|
| 2 | 1 |
0.3%
|
|
| 3 | 9 |
3%
|
|
| 4 | 24 |
8%
|
|
| 5 | 38 |
12.6%
|
|
| 6 | 67 |
22.3%
|
|
| 7 | 59 |
19.6%
|
|
| 8 | 53 |
17.6%
|
|
| 9 | 31 |
10.3%
|
|
| 10 | Very effective | 17 |
5.6%
|
| -99 | 2 | ||
| 11 | Don't know | 63 | |
| Sysmiss | 55 |