| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 70 |
2.9%
|
| 1 | Not very effective | 313 |
13.1%
|
| 2 | Somewhat effective | 1101 |
45.9%
|
| 3 | Very effective | 737 |
30.7%
|
| 9 | Don't know | 176 |
7.3%
|
| 98 | Refused | 0 |
0%
|