| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 35 |
67.3%
|
| 2 | 1 year to less than 3 years | 15 |
28.8%
|
| 3 | 3 years or more | 2 |
3.8%
|
| Sysmiss | 948 |