The study included 19,064 subjects (9770 men, 9294 women). There were more people in organizations with less than 300 employees, and more people worked in the private sector than in the public sector. Between age and number of employees, age and public/private sector showed significant differences (p < 0.001). In organizations with less than 300 employees, the number of people aged between 41 and 50 was high, while those with more than 300 workers were between 31 and 40. There were many workers in the 41–50 age group in both private and public sectors. The proportion of male and high education level workers was significantly higher in organizations with more than 300 employees than that of organizations with up to 300 employees (p < 0.001). In the private sector, the proportion of men and high education level workers was high (p < 0.001). There was no difference in the general health condition according to the number of workers (p = 0.060), and more people in the public sector answered that they had good general health condition (p < 0.001). Between monthly income and number of employees, monthly income and public/private sector were significantly different (p < 0.001). In organizations with more than 300 employees, the proportion of people with income over 3 million won was high. The proportion of high job stress of the private sector was significantly higher than that of high job stress of the public sector (p < 0.001) (Table 1).Table 1Subjects’ General characteristics according to Occupational characteristicsNumber of employeesSectorTotal<300 (%)≥300 (%)Public (%)Private (%)Total19064a (100%)17436 (91.5)1628 (8.5)2399 (12.6)16665 (87.4)Age ≤ 303302 (17.3)3040 (17.4)262 (16.1)<0.001b 221 (9.2)3081 (18.5)<0.001b 31 ~ 405201 (27.3)4626 (26.5)576 (35.4)580 (24.2)4621 (27.7) 41 ~ 505480 (28.7)5025 (28.8)455 (27.9)750 (31.3)4731 (28.4) 51 ~ 603383 (17.7)3086 (17.7)297 (18.2)448 (18.7)2935 (17.6) ≥ 611698 (8.9)1660 (9.5)38 (2.3)400 (16.7)1297 (7.8)Sex Male9770 (51.2)8582 (49.2)1188 (73.0)<0.001b 1149 (47.9)8622 (51.7)<0.001b Female9294 (48.8)8854 (50.8)440 (27.0)1250 (52.1)8044 (48.3)Educational level High school or lower8928 (46.8)8406 (48.2)523 (32.1)<0.001b 800 (33.3)8129 (48.8)<0.001b College or higher10136 (53.2)9031 (51.8)1105 (67.9)1599 (66.7)8536 (51.2)General health condition Good18525 (97.2)16931 (97.1)1594 (97.9)0.060b 2290 (95.5)16235 (97.4)<0.001b Bad539 (2.8)505 (2.9)34 (2.1)109 (4.5)430 (2.6)Income < 1001906 (10.0)1881 (10.8)25 (1.5)<0.001b 504 (21.0)1402 (8.4)<0.001b 100 ~ 1996475 (34.0)6282 (36.0)192 (11.8)408 (17.0)6066 (36.4) 200 ~ 2995737 (30.1)5289 (30.3)448 (27.5)618 (25.8)5119 (30.7) ≥ 3004946 (25.9)3984 (22.8)962 (59.1)868 (36.2)4078 (24.5)Job stress High14443 (75.8)13174 (75.6)1269 (77.9)0.031b 1711 (71.3)12733 (76.4)<0.001b Low4621 (24.2)4262 (24.4)359 (22.1)688 (28.7)3933 (23.6) aweighted frequency bBased on the chi-square test