| Value | Category | Cases | |
|---|---|---|---|
| 0 | Less than a month | 3 |
0.2%
|
| 1 | 1-5 months | 14 |
0.9%
|
| 2 | 6-12 months | 11 |
0.7%
|
| 3 | Over a year | 57 |
3.6%
|
| 88 | N/A | 1482 |
94.6%
|
| Sysmiss | 14 |