| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 71 |
5.9%
|
| 1 | Not very effective | 260 |
21.7%
|
| 2 | Somewhat effective | 529 |
44.1%
|
| 3 | Very effective | 272 |
22.7%
|
| 9 | Don't know | 68 |
5.7%
|
| 998 | Refused | 0 |
0%
|