| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 22 |
1.8%
|
| 1 | Not very effective | 132 |
11%
|
| 2 | Somewhat effective | 655 |
54.6%
|
| 3 | Very effective | 371 |
30.9%
|
| 9 | Don't know | 20 |
1.7%
|
| 998 | Refused | 0 |
0%
|