| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 43 |
65.2%
|
| 2 | 1 year to less than 3 years | 20 |
30.3%
|
| 3 | 3 years or more | 3 |
4.5%
|
| Sysmiss | 934 |