| Number of participants, n (%) | ||||||
|---|---|---|---|---|---|---|
| Total | 2009-2011 | 2012-2014 | 2015-2017 | 2018-2019 | 2020-2021 | |
| 19-39 | 746,572 (26.3) | 201,994 (30.6) | 178,942 (27.6) | 166,143 (25.4) | 98,128 (22.8) | 101,365 (22.6) |
| 40-59 | 1,101,580 (38.8) | 264,883 (40.2) | 265,428 (41.0) | 255,822 (39.0) | 157,112 (36.5) | 158,335 (35.2) |
| ≥ 60 | 994,279 (35.0) | 192,515 (29.2) | 203,458 (31.4) | 233,219 (35.6) | 175,431 (40.7) | 189,656 (42.2) |
| Sex | ||||||
| Male | 1,320,239 (46.4) | 308,761 (46.8) | 302,743 (46.7) | 303,856 (46.4) | 197,849 (45.9) | 207,030 (46.1) |
| Female | 1,522,192 (53.6) | 350,631 (53.2) | 345,085 (53.3) | 351,328 (53.6) | 232,822 (54.1) | 242,326 (53.9) |
| Urban | 1,400,118 (49.3) | 322,476 (48.9) | 322,752 (49.8) | 323,399 (49.4) | 212,278 (49.3) | 219,213 (48.8) |
| Rural | 1,442,313 (50.7) | 336,916 (51.1) | 325,076 (50.2) | 331,785 (50.6) | 218,393 (50.7) | 230,143 (51.2) |
| < 3 million won | 1,240,696 (43.6) | 276,633 (42.0) | 282,412 (43.6) | 349,813 (53.4) | 162,942 (37.8) | 168,896 (37.6) |
| ≥3 million won | 1,103,691 (38.8) | 186,409 (28.3) | 239,772 (37.0) | 299,322 (45.7) | 191,229 (44.4) | 186,959 (41.6) |
| Unknown | 498,044 (17.5) | 196,350 (29.8) | 125,644 (19.4) | 6049 (0.9) | 76,500 (17.8) | 93,501 (20.8) |
| No | 2,283,921 (80.4) | 508,517 (77.1) | 510,832 (78.9) | 533,308 (81.4) | 355,777 (82.6) | 375,487 (83.6) |
| Yes | 558,510 (19.6) | 150,875 (22.9) | 136,996 (21.1) | 121,876 (18.6) | 74,894 (17.4) | 73,869 (16.4) |
| 0 | 1,350,954 (47.5) | 317,491 (48.1) | 303,185 (46.8) | 304,665 (22.1) | 210,045 (48.8) | 215,568 (48.0) |
| 1-4 | 833,378 (29.3) | 203,369 (30.8) | 201,152 (31.1) | 202,627 (30.9) | 126,831 (29.4) | 99,399 (22.1) |
| 5-30 | 658,099 (23.2) | 138,532 (21.0) | 143,491 (22.1) | 147,892 (22.6) | 93,795 (29.4) | 134,389 (29.9) |
| Under and normal (<23.0) | 1,382,130 (48.6) | 348,242 (52.8) | 331,198 (51.1) | 317,195 (48.5) | 183,003 (42.5) | 202,492 (45.1) |
| Over and obese (≥23.0) | 1,460,301 (51.4) | 311,150 (47.1) | 316,630 (48.9) | 337,989 (51.6) | 247,668 (57.5) | 246,864 (54.9) |
| White-collar | 560,735 (19.7) | 123,918 (18.8) | 130,035 (20.1) | 132,609 (20.2) | 84,139 (19.5) | 90,034 (20.0) |
| Blue-collar | 1,226,498 (43.1) | 275,920 (41.8) | 285,753 (44.1) | 289,735 (44.2) | 186,641 (43.3) | 188,449 (41.9) |
| Unknown | 1,055,198 (37.1) | 259,554 (39.4) | 232,040 (35.8) | 232,840 (35.5) | 159,891 (37.1) | 170,873 (38.0) |
| ≤High school | 1,818,688 (64.0) | 443,971 (67.3) | 417,839 (64.5) | 411,419 (62.8) | 271,481 (63.0) | 273,978 (61.0) |
| ≥College | 1,023,743 (36.0) | 215,421 (32.7) | 229,989 (35.5) | 243,765 (37.2) | 159,190 (37.0) | 175,378 (39.0) |
| Married | 1,993,239 (70.1) | 473,058 (71.7) | 465,832 (71.9) | 459,194 (70.1) | 297,013 (69.0) | 298,142 (66.3) |
| Single | 849,192 (29.9) | 186,334 (28.3) | 181,996 (28.1) | 195,990 (29.9) | 133,658 (31.0) | 151,214 (33.7) |
| No | 2,669,749 (93.9) | 619,656 (94.0) | 609,600 (94.1) | 614,335 (93.8) | 405,436 (94.1) | 420,722 (93.6) |
| Yes | 172,682 (6.1) | 39,736 (6.0) | 38,228 (5.9) | 40,849 (6.2) | 25,235 (5.9) | 28,634 (6.4) |
| No | 2,810,464 (98.9) | 653,189 (99.1) | 641,411 (99.0) | 647,824 (98.9) | 425,359 (98.8) | 442,681 (98.5) |
| Yes | 31,967 (1.1) | 6,203 (0.9) | 6,417 (1.0) | 7,360 (1.1) | 5,312 (1.2) | 6,675 (1.5) |
| Sleep time, hours/day, mean (SD) | 6.65 (1.25) | 6.71 (1.25) | 6.63 (1.23) | 6.56 (1.23) | 6.63 (1.26) | 6.77 (1.27) |