| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0.1%
|
| 0 | Not at all effective | 75 |
6.3%
|
| 1 | Not very effective | 116 |
9.7%
|
| 2 | Somewhat effective | 575 |
47.9%
|
| 3 | Very effective | 399 |
33.3%
|
| 9 | Don’t know | 34 |
2.8%
|
| 98 | Refused | 0 |
0%
|