| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 22 |
31.4%
|
| 2 | 12-23 months ago | 8 |
11.4%
|
| 3 | 2 or more years ago | 16 |
22.9%
|
| 9 | Missing | 24 |
34.3%
|
| Sysmiss | 1489 |