| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 202 |
8.4%
|
| 1 | Not very effective | 766 |
31.9%
|
| 2 | Somewhat effective | 975 |
40.6%
|
| 3 | Very effective | 415 |
17.3%
|
| 9 | Don't know | 42 |
1.8%
|
| 998 | Refused | 0 |
0%
|