| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months | 2109 |
43.8%
|
| 2 | 12-23 months | 1390 |
28.9%
|
| 3 | 2 years or more | 1313 |
27.3%
|
| 9 | Missing | 61 | |
| Sysmiss | 29723 |