| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 20 |
43.5%
|
| 2 | 12-23 months ago | 4 |
8.7%
|
| 3 | 2 or more years ago | 17 |
37%
|
| 9 | Missing | 5 |
10.9%
|
| Sysmiss | 1411 |