| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 13 |
1.1%
|
| 1 | Not very effective | 43 |
3.6%
|
| 2 | Somewhat effective | 101 |
8.5%
|
| 3 | Very effective | 878 |
73.7%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don't know | 156 |
13.1%
|