| Value | Category | Cases | |
|---|---|---|---|
| -999 | -999 | 0 |
0%
|
| -888 | -888 | 10 |
12.5%
|
| 1 | More than one month | 5 |
6.3%
|
| 2 | Once every month | 5 |
6.3%
|
| 3 | Once every two months | 10 |
12.5%
|
| 4 | Once every three months | 28 |
35%
|
| 5 | Less than once every three months | 22 |
27.5%
|
| Sysmiss | 832 |