| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 189 |
43.3%
|
| 2 | 1 year to less than 3 years | 205 |
47%
|
| 3 | 3 years or more | 41 |
9.4%
|
| 9 | Unspecified | 1 |
0.2%
|
| Sysmiss | 9563 |