| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 9 |
9.5%
|
| 2 | 12-23 months ago | 6 |
6.3%
|
| 3 | 2 or more years ago | 65 |
68.4%
|
| 9 | Missing | 15 |
15.8%
|
| Sysmiss | 5473 |