| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 733 |
10.5%
|
| 2 | 6 months to less than 12 months | 338 |
4.8%
|
| 3 | 12 months or more | 2890 |
41.2%
|
| 4 | Not elsewhere classified | 3053 |
43.5%
|
| Sysmiss | 40331 |