| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 19 |
45.2%
|
| 2 | 12-23 months ago | 12 |
28.6%
|
| 3 | 2 or more years ago | 10 |
23.8%
|
| 9 | Missing | 1 |
2.4%
|
| Sysmiss | 6608 |