| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Less than a year | 681 |
33.3%
|
| 2 | 2. 1 year to less than 3 years | 986 |
48.1%
|
| 3 | 3. 3 years or more | 356 |
17.4%
|
| 9 | 9. Unspecified | 25 |
1.2%
|
| Sysmiss | 63279 |