| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 800 |
35.6%
|
| 2 | 1 year to less than 3 years | 1083 |
48.2%
|
| 3 | 3 years or more | 349 |
15.5%
|
| 9 | Unspecified | 16 |
0.7%
|
| Sysmiss | 66089 |