| Value | Category | Cases | |
|---|---|---|---|
| -999 | -999 | 5 |
1.6%
|
| -888 | -888 | 80 |
26.1%
|
| 1 | More than one month | 18 |
5.9%
|
| 2 | Once every month | 12 |
3.9%
|
| 3 | Once every two months | 19 |
6.2%
|
| 4 | Once every three months | 86 |
28%
|
| 5 | Less than once every three months | 87 |
28.3%
|
| Sysmiss | 605 |