| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 156 |
37.9%
|
| 2 | 1 year to less than 3 years | 204 |
49.5%
|
| 3 | 3 years or more | 48 |
11.7%
|
| 9 | Unspecified | 4 |
1%
|
| Sysmiss | 9587 |