| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within past month | 119 |
35.5%
|
| 2 | Within past 3 months | 73 |
21.8%
|
| 3 | Within 6 months | 49 |
14.6%
|
| 4 | More than 6 months ago | 94 |
28.1%
|
| Sysmiss | 12145 |