| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 45 |
3.8%
|
| 1 | Not very effective | 251 |
20.9%
|
| 2 | Somewhat effective | 419 |
34.9%
|
| 3 | Very effective | 372 |
31%
|
| 9 | Don't know | 113 |
9.4%
|
| 998 | Refused | 0 |
0%
|