| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months | 254 |
49.1%
|
| 2 | 12-23 months | 115 |
22.2%
|
| 3 | 2 years or more | 148 |
28.6%
|
| 9 | Missing | 8 | |
| Sysmiss | 7460 |