| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 255 |
10.6%
|
| 1 | Not very effective | 777 |
32.4%
|
| 2 | Somewhat effective | 956 |
39.8%
|
| 3 | Very effective | 348 |
14.5%
|
| 9 | Don't know | 64 |
2.7%
|
| 98 | Refused | 0 |
0%
|