| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within past month | 654 |
48.6%
|
| 2 | Within past 3 months | 228 |
17%
|
| 3 | Within 6 months | 119 |
8.8%
|
| 4 | More than 6 months ago | 344 |
25.6%
|
| Sysmiss | 11135 |