| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 661 |
32.1%
|
| 2 | 1 year to less than 3 years | 1009 |
49%
|
| 3 | 3 years or more | 378 |
18.4%
|
| 9 | Unspecified | 11 |
0.5%
|
| Sysmiss | 65218 |