Table 1 Sample characteristics
Variable | N (%) |
|---|---|
Gender | |
 Men | 2074 (97.4) |
 Women | 55 (2.6) |
Age (years old) | |
 29 or lower | 561 (26.4) |
 30-39 | 838 (39.4) |
 40-49 | 585 (27.5) |
 50+ | 145 (6.8) |
Marital status | |
 Unmarried (never married or divorced) | 554 (26.1) |
 Married | 1575 (74.0) |
Education | |
 High school or lower | 1885 (88.5) |
 Undergraduate degree | 228 (10.7) |
 Master’s degree and above | 16 (0.8) |
Income (in Yuan, per month) | |
 0-4,999 | 508 (23.9) |
 5,000-9,999 | 1461 (68.6) |
 10,000+ | 154 (7.2) |
Job tenure (in years) | |
 0-9 | 815 (38.3) |
 10-19 | 1053 (49.5) |
 20+ | 259 (12.2) |
Job level | |
 None | 802 (37.7) |
 Junior | 512 (24.0) |
 Intermediate | 329 (15.5) |
 Senior | 486 (22.8) |
Shift work | |
 Fixed day shift | 812 (38.1) |
 Shift work | 1317 (61.9) |