| Value | Category | Cases | |
|---|---|---|---|
| 0 | nonresponse | 0 |
0%
|
| 1 | weeks | 65 |
3.1%
|
| 2 | months | 151 |
7.3%
|
| 3 | years | 1864 |
89.6%
|
| 9 | na | 0 |
0%
|
| 99 | 1 |
0%
|
|
| Sysmiss | 919 |