| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 115 |
61.8%
|
| 2 | 12-23 months ago | 57 |
30.6%
|
| 3 | 2 or more years ago | 13 |
7%
|
| 9 | Missing | 1 |
0.5%
|
| Sysmiss | 4815 |