| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 90 |
7.5%
|
| 1 | Not very effective | 118 |
9.8%
|
| 2 | Somewhat effective | 270 |
22.5%
|
| 3 | Very effective | 516 |
43%
|
| 9 | Don't know | 206 |
17.2%
|
| 98 | Refused | 0 |
0%
|