| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 month | 23 |
3.6%
|
| 2 | One to three months | 37 |
5.8%
|
| 3 | Four to six months | 63 |
9.9%
|
| 4 | More than six months | 454 |
71.6%
|
| 5 | Not applicable | 56 |
8.8%
|
| 99 | 1 |
0.2%
|
|
| Sysmiss | 3940 |