| Value | Category | Cases | |
|---|---|---|---|
| -999 | -999 | 1 |
2%
|
| -888 | -888 | 7 |
14.3%
|
| 1 | More than one month | 0 |
0%
|
| 2 | Once every month | 2 |
4.1%
|
| 3 | Once every two months | 3 |
6.1%
|
| 4 | Once every three months | 17 |
34.7%
|
| 5 | Less than once every three months | 19 |
38.8%
|
| Sysmiss | 863 |