| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 51 |
4.3%
|
| 1 | Not very effective | 217 |
18.1%
|
| 2 | Somewhat effective | 586 |
48.8%
|
| 3 | Very effective | 241 |
20.1%
|
| 9 | Don't know | 105 |
8.8%
|
| 98 | Refused | 0 |
0%
|