| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 285 |
25.2%
|
| 2 | 1 year to less than 3 years | 598 |
52.9%
|
| 3 | 3 years or more | 236 |
20.9%
|
| 9 | Unspecified | 12 |
1.1%
|
| Sysmiss | 42706 |