| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not at all effective | 532 |
22.2%
|
| 1 | Not very effective | 453 |
18.9%
|
| 2 | Somewhat effective | 646 |
26.9%
|
| 3 | Very effective | 250 |
10.4%
|
| 9 | Don't know | 519 |
21.6%
|
| 98 | Refused | 0 |
0%
|