| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 965 |
44.6%
|
| 2 | 12-23 months ago | 1057 |
48.8%
|
| 3 | 2 or more years ago | 124 |
5.7%
|
| 9 | Missing | 19 |
0.9%
|
| Sysmiss | 31532 |