| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than one month ago | 14 |
4.5%
|
| 2 | 1 to 6 months ago | 71 |
23.1%
|
| 3 | 6 to 12 months ago | 117 |
38%
|
| 4 | More than one year ago | 106 |
34.4%
|
| Sysmiss | 2884 |