| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within past month | 65 |
57.5%
|
| 2 | Within past 3 months | 18 |
15.9%
|
| 3 | Within 6 months | 11 |
9.7%
|
| 4 | More than 6 months ago | 19 |
16.8%
|
| Sysmiss | 12367 |