Table 1.
Baseline characteristics of study participants by workplace size
| Variable | 1 | 2–4 | 5–29 | 30–49 | 50–99 | 100–299 | 300–999 | ≥ 1,000 | Total |
|---|---|---|---|---|---|---|---|---|---|
| N | 89,227 | 1,183,181 | 3,422,154 | 829,052 | 959,997 | 1,370,392 | 1,105,375 | 2,253,134 | 11,212,512 |
| Sex, n (%) | |||||||||
| Male | 52,828 (59.2) | 581,475 (49.1) | 1,723,964 (50.4) | 452,159 (54.5) | 539,924 (56.2) | 825,421 (60.2) | 684,961 (62.0) | 1,399,351 (62.1) | 6,260,083 (55.8) |
| Female | 36,399 (40.8) | 601,706 (50.9) | 1,698,190 (49.6) | 376,893 (45.5) | 420,073 (43.8) | 544,971 (39.8) | 420,414 (38.0) | 853,783 (37.9) | 4,952,429 (44.2) |
| Age, mean (SD) | 46.1 (11.3) | 43.2 (11.9) | 42.8 (12.0) | 43.1 (12.4) | 42.6 (12.3) | 41.4 (11.9) | 40.0 (11.7) | 39.2 (11.1) | 41.7 (11.9) |
| 15–24 | 4,004 (4.5) | 76,946 (6.5) | 226,403 (6.6) | 53,284 (6.4) | 61,864 (6.4) | 90,674 (6.6) | 79,302 (7.2) | 177,615 (7.9) | 770,092 (6.9) |
| 25–34 | 11,700 (13.1) | 234,896 (19.9) | 748,567 (21.9) | 189,151 (22.8) | 233,933 (24.4) | 372,352 (27.2) | 344,425 (31.2) | 699,502 (31.0) | 2,834,526 (25.3) |
| 35–44 | 20,016 (22.4) | 291,466 (24.6) | 823,435 (24.1) | 189,423 (22.8) | 223,948 (23.3) | 343,135 (25.0) | 287,672 (26.0) | 616,705 (27.4) | 2,795,800 (24.9) |
| 45–54 | 29,902 (33.5) | 335,737 (28.4) | 924,922 (27.0) | 206,274 (24.9) | 232,826 (24.3) | 321,509 (23.5) | 231,994 (21.0) | 517,698 (23.0) | 2,800,862 (25.0) |
| 55–64 | 23,605 (26.5) | 244,136 (20.6) | 698,827 (20.4) | 190,920 (23.0) | 207,426 (21.6) | 242,722 (17.7) | 161,982 (14.7) | 241,614 (10.7) | 2,011,232 (17.9) |
| Income, mean (SD)ᵃ | 2,796 (2,560) | 2,473 (2,069) | 3,299 (2,889) | 3,770 (3,399) | 3,963 (3,604) | 4,468 (3,838) | 5,204 (4,273) | 6,697 (5,006) | 4,313 (3,949) |
| Median income income | 2,220 | 2,200 | 2,753 | 3,161 | 3,288 | 3,747 | 4,404 | 5,760 | 3,655 |
ᵃ Income in 10,000 Korean Won (KRW)
Abbreviation: SD standard deviation