| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 63 |
2.6%
|
| 1 | Not very effective | 246 |
10.3%
|
| 2 | Somewhat effective | 957 |
39.9%
|
| 3 | Very effective | 1007 |
42%
|
| 9 | Don't know | 127 |
5.3%
|
| 998 | Refused | 0 |
0%
|