| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Not at all effective | 44 |
3.7%
|
| 1 | Not very effective | 142 |
11.8%
|
| 2 | Somewhat effective | 357 |
29.8%
|
| 3 | Very effective | 598 |
49.8%
|
| 9 | Don't know | 59 |
4.9%
|
| 998 | Refused | 0 |
0%
|