| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 93 |
7.8%
|
| 1 | Not very effective | 183 |
15.3%
|
| 2 | Somewhat effective | 488 |
40.7%
|
| 3 | Very effective | 385 |
32.1%
|
| 9 | Don't know | 51 |
4.3%
|
| 998 | Refused | 0 |
0%
|