| Value | Category | Cases | |
|---|---|---|---|
| 1 | Convenience in work | 20653 |
19.2%
|
| 2 | Studying, training | 759 |
0.7%
|
| 3 | housekeeping | 1229 |
1.1%
|
| 4 | Old, ill | 442 |
0.4%
|
| 5 | Others | 245 |
0.2%
|
| Sysmiss | 84033 |