| Value | Category | Cases | |
|---|---|---|---|
| 1 | Last month | 5 |
1.5%
|
| 2 | 1-6 months ago | 21 |
6.5%
|
| 3 | 6-12 months ago | 53 |
16.4%
|
| 4 | More than a year ago | 231 |
71.5%
|
| 9 | Missing | 13 |
4%
|
| Sysmiss | 860 |