| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 17 |
47.2%
|
| 2 | 1 year to less than 3 years | 14 |
38.9%
|
| 3 | 3 years or more | 5 |
13.9%
|
| 9 | Unspecified | 0 |
0%
|
| Sysmiss | 964 |