| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within past month | 215 |
46.4%
|
| 2 | Within past 3 months | 81 |
17.5%
|
| 3 | Within 6 months | 42 |
9.1%
|
| 4 | More than 6 months ago | 125 |
27%
|
| Sysmiss | 12017 |