| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 160 |
49.2%
|
| 2 | 12-23 months ago | 55 |
16.9%
|
| 3 | 2 or more years ago | 83 |
25.5%
|
| 9 | Missing | 27 |
8.3%
|
| Sysmiss | 6325 |