| value | category | cases | |
|---|---|---|---|
| 1 | Less than 12 months | 42 |
32.1%
|
| 2 | 12-23 months | 33 |
25.2%
|
| 3 | 2 years or more | 56 |
42.7%
|
| 9 | 1 | ||
| Sysmiss | 2208 |