| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 |
0.6%
|
| 2 | 6 |
1.8%
|
|
| 3 | 5 |
1.5%
|
|
| 4 | 15 |
4.4%
|
|
| 5 | 41 |
12.1%
|
|
| 6 | 41 |
12.1%
|
|
| 7 | 69 |
20.3%
|
|
| 8 | 76 |
22.4%
|
|
| 9 | 55 |
16.2%
|
|
| 10 | Very effective | 30 |
8.8%
|
| -99 | 63 | ||
| 11 | Don't know | 101 | |
| Sysmiss | 153 |