Table 1 Basic characteristics of the study subjects
Total | Primary-rural | Primary-urban | Non-primary | P value | |
|---|---|---|---|---|---|
Sample size | 9475 | 3786 | 2561 | 3128 | |
Age (y) | 38.656 ± 9.704 | 39.891 ± 10.123 | 36.381 ± 9.031 | 39.022 ± 9.395 | < 0.001 |
Sex | |||||
Male | 3378 (35.65) | 1511 (39.91) | 557 (21.75) | 1310 (41.88) | < 0.001 |
Female | 6097 (64.35) | 2275 (60.09) | 2004 (78.25) | 1818 (58.12) | |
Child status | |||||
Absence | 2161 (22.81) | 621 (16.40) | 776 (30.30) | 764 (24.42) | < 0.001 |
Primary school and below | 3877 (40.92) | 1386 (36.61) | 1201 (46.90) | 1290 (41.24) | |
Junior high school and above | 3437 (36.27) | 1779 (46.99) | 584 (22.80) | 1074 (34.34) | |
Job title | |||||
Primary and below | 5822 (61.45) | 2945 (77.79) | 1450 (56.62) | 1427 (45.62) | < 0.001 |
Intermediate | 2682 (28.31) | 718 (18.96) | 930 (36.31) | 1034 (33.06) | |
Advanced | 971 (10.25) | 123 (3.25) | 181 (7.07) | 667 (21.32) | |
Province | < 0.001 | ||||
Sichuan | 3360 (35.46) | 1812 (47.86) | 610 (23.82) | 938 (29.99) | |
Guangdong | 2812 (29.68) | 455 (12.02) | 1559 (60.87) | 798 (25.51) | |
Jiangsu | 1227 (12.95) | 564 (14.90) | 193 (7.54) | 470 (15.03) | |
Hubei | 1401 (14.79) | 893 (23.59) | 135 (5.27) | 373 (11.92) | |
Gansu | 675 (7.12) | 62 (1.64) | 64 (2.50) | 549 (17.55) |