| Value | Category | Cases | |
|---|---|---|---|
| -999 | -999 | 0 |
0%
|
| -888 | -888 | 6 |
9.1%
|
| 1 | More than one month | 4 |
6.1%
|
| 2 | Once every month | 6 |
9.1%
|
| 3 | Once every two months | 6 |
9.1%
|
| 4 | Once every three months | 24 |
36.4%
|
| 5 | Less than once every three months | 20 |
30.3%
|
| Sysmiss | 846 |