| Value | Category | Cases | |
|---|---|---|---|
| 1 | <6m | 84 |
8.9%
|
| 2 | 6-10m | 119 |
12.5%
|
| 3 | 11-15m | 98 |
10.3%
|
| 4 | >=16m | 386 |
40.7%
|
| 5 | don't know | 262 |
27.6%
|
| Sysmiss | 851 |