| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 10 |
0.8%
|
| 0 | Not at all effective | 403 |
33.6%
|
| 1 | Not very effective | 142 |
11.8%
|
| 2 | Somewhat effective | 334 |
27.8%
|
| 3 | Very effective | 177 |
14.8%
|
| 9 | Don't know | 134 |
11.2%
|
| 98 | Refused | 0 |
0%
|