| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within past month | 4 |
26.7%
|
| 2 | Within past 3 months | 5 |
33.3%
|
| 3 | Within 6 months | 1 |
6.7%
|
| 4 | More than 6 months ago | 5 |
33.3%
|
| Sysmiss | 12465 |