| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 118 |
49.8%
|
| 2 | 12-23 months ago | 42 |
17.7%
|
| 3 | 2 or more years ago | 58 |
24.5%
|
| 9 | Missing | 19 |
8%
|
| Sysmiss | 5602 |