| Value | Category | Cases | |
|---|---|---|---|
| 1 | Yes, I have used it | 3 |
1%
|
| 2 | Yes, but I have not used it | 12 |
4%
|
| 3 | No, there is no system | 231 |
77%
|
| 98 | I don't know | 54 |
18%
|
| Sysmiss | 2 |