| Value | Category | Cases | |
|---|---|---|---|
| 1 | within last 6 months | 90 |
68.2%
|
| 2 | 7-12 months | 17 |
12.9%
|
| 3 | more than 1 year ago | 25 |
18.9%
|
| 8 | Do not know | 0 |
0%
|
| Sysmiss | 4027 |