| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| 1 | Per day | 89 |
20.1%
|
| 2 | Per week | 162 |
36.7%
|
| 3 | Per month | 191 |
43.2%
|
| Sysmiss | 2881 |