| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not at all effective | 84 |
3.5%
|
| 1 | Not very effective | 293 |
12.2%
|
| 2 | Somewhat effective | 1021 |
42.6%
|
| 3 | Very effective | 936 |
39%
|
| 9 | Don't know | 65 |
2.7%
|