| Value | Category | Cases | |
|---|---|---|---|
| -222 | 2 |
0.2%
|
|
| 0 | Never | 317 |
24.7%
|
| 1 | Once a month | 313 |
24.4%
|
| 2 | Twice or more than twice in a month | 653 |
50.8%
|
| Sysmiss | 13 |