| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 3 months | 147 |
6.2%
|
| 2 | From 3 to 8 months | 2193 |
93.2%
|
| 3 | More than 8 months | 13 |
0.6%
|
| 9 | Missing | 0 |
0%
|
| Sysmiss | 8610 |