| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 87 |
7.3%
|
| 1 | Not very effective | 215 |
17.9%
|
| 2 | Somewhat effective | 401 |
33.4%
|
| 3 | Very effective | 419 |
34.9%
|
| 9 | Don't know | 78 |
6.5%
|
| 998 | Refused | 0 |
0%
|