| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 150 |
12.5%
|
| 1 | Not very effective | 313 |
26.2%
|
| 2 | Somewhat effective | 460 |
38.5%
|
| 3 | Very effective | 128 |
10.7%
|
| 9 | Don't know | 145 |
12.1%
|
| 998 | Refused | 0 |
0%
|