| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0.1%
|
| 0 | Not at all effective | 133 |
11.1%
|
| 1 | Not very effective | 259 |
21.6%
|
| 2 | Somewhat effective | 587 |
49%
|
| 3 | Very effective | 73 |
6.1%
|
| 9 | Don’t know | 145 |
12.1%
|
| 98 | Refused | 0 |
0%
|