| Value | Category | Cases | |
|---|---|---|---|
| 1 | Convenience in work | 7975 |
26.7%
|
| 2 | Studying, training | 120 |
0.4%
|
| 3 | housekeeping | 240 |
0.8%
|
| 4 | Old, ill | 123 |
0.4%
|
| 5 | Others | 400 |
1.3%
|
| Sysmiss | 21036 |