| Value | Category | Cases | |
|---|---|---|---|
| -999 | DO NOT KNOW | 10 |
1.6%
|
| 1 | Less than 6 months | 7 |
1.1%
|
| 2 | 3-6 months | 12 |
1.9%
|
| 3 | 7-9 months | 31 |
4.9%
|
| 4 | 10-11 months | 27 |
4.3%
|
| 5 | 12 months | 545 |
86.2%
|
| Sysmiss | 121 |