| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 12 |
44.4%
|
| 2 | 12-23 months ago | 7 |
25.9%
|
| 3 | 2 or more years ago | 8 |
29.6%
|
| 9 | Missing | 0 |
0%
|
| Sysmiss | 491 |