| Value | Category | Cases | |
|---|---|---|---|
| 1 | Convenience in work | 19856 |
17.5%
|
| 2 | Studying, training | 511 |
0.5%
|
| 3 | housekeeping | 1330 |
1.2%
|
| 4 | Old, ill | 492 |
0.4%
|
| 5 | Others | 372 |
0.3%
|
| Sysmiss | 90881 |