| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 353 |
47.3%
|
| 2 | 6 months to less than 12 months | 56 |
7.5%
|
| 3 | 12 months or more | 174 |
23.3%
|
| 4 | Length not stated | 163 |
21.8%
|
| Sysmiss | 26665 |