| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 743 |
33.3%
|
| 2 | 1 year to less than 3 years | 1099 |
49.2%
|
| 3 | 3 years or more | 355 |
15.9%
|
| 9 | Unspecified | 35 |
1.6%
|
| Sysmiss | 64173 |