| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 417 |
17.4%
|
| 1 | Not very effective | 826 |
34.4%
|
| 2 | Somewhat effective | 736 |
30.7%
|
| 3 | Very effective | 153 |
6.4%
|
| 9 | Don't know | 268 |
11.2%
|
| 998 | Refused | 0 |
0%
|