Table 1. Baseline characteristics according to sleep duration group
Characteristics Overall1 Short sleep1 Adequate sleep1 Long sleep1 p-value2
Age, years 42.5 ± 12.9 44.1 ± 12.5 41.9 ± 12.9 37.1 ± 13.7 <0.001
Sex



<0.001
    남자 9,216 (52.4%) 3,781 (54.3%) 4,963 (51.9%) 472 (44.1%)
    여자 11,141 (47.6%) 4,201 (45.7%) 6,183 (48.1%) 757 (55.9%)
Household income



<0.001
    하 4,867 (23.6%) 1,881 (23.0%) 2,602 (23.1%) 384 (31.1%)
    중하 5,095 (25.3%) 1,946 (24.7%) 2,827 (25.5%) 322 (26.6%)
    중상 5,194 (25.9%) 2,071 (26.3%) 2,849 (26.0%) 274 (22.8%)
    상 5,201 (25.3%) 2,084 (26.0%) 2,868 (25.4%) 249 (19.5%)
Education level



<0.001
    초졸 이하 824 (3.0%) 384 (3.6%) 376 (2.5%) 64 (4.2%)
    중졸 1,194 (4.8%) 524 (5.3%) 594 (4.5%) 76 (4.9%)
    고졸 7,858 (39.0%) 3,013 (38.0%) 4,277 (38.7%) 568 (47.8%)
    대졸 이상 10,481 (53.2%) 4,061 (53.1%) 5,899 (54.3%) 521 (43.2%)
Smoking status



0.058
    비흡연 16,567 (79.6%) 6,429 (79.0%) 9,162 (80.2%) 976 (77.6%)
    현재흡연 3,790 (20.4%) 1,553 (21.0%) 1,984 (19.8%) 253 (22.4%)
Alcohol drinking



0.018
    월 1회 이하 10,302 (49.2%) 3,985 (48.5%) 5,675 (49.5%) 642 (50.9%)
    월 2회~주 3회 8,820 (44.5%) 3,477 (44.9%) 4,853 (44.7%) 490 (41.1%)
    주 4회 이상 1,235 (6.3%) 520 (6.6%) 618 (5.8%) 97 (8.0%)
BMI, kg/m² 24.2 ± 4.0 24.6 ± 4.0 24.0 ± 3.9 23.7 ± 4.1 <0.001
Sleep duration, hours/day 7.1 ± 1.2 6.0 ± 0.7 7.6 ± 0.5 9.5 ± 0.7 <0.001
Aerobic physical activity, min/week 265.1 ± 394.1 278.2 ± 425.2 259.2 ± 377.1 236.0 ± 332.0 0.067
Muscle-strengthening exercise



0.5
    근력X 15,277 (73.6%) 5,997 (74.1%) 8,362 (73.3%) 918 (73.0%)
    근력O 5,080 (26.4%) 1,985 (25.9%) 2,784 (26.7%) 311 (27.0%)
Exercise combination



0.2
    75분 미만 + 근력X 6,514 (30.6%) 2,506 (30.1%) 3,575 (30.5%) 433 (33.7%)
    75분 미만 + 근력O 941 (4.5%) 378 (4.5%) 506 (4.6%) 57 (4.2%)
    75분 이상 + 근력X 8,763 (43.0%) 3,491 (44.0%) 4,787 (42.7%) 485 (39.3%)
    75분 이상 + 근력O 4,139 (21.9%) 1,607 (21.4%) 2,278 (22.1%) 254 (22.8%)
Metabolic syndrome



<0.001
    대사증후군 없음 14,509 (72.2%) 5,407 (68.7%) 8,154 (73.9%) 948 (78.8%)
    대사증후군 있음 5,848 (27.8%) 2,575 (31.3%) 2,992 (26.1%) 281 (21.2%)
Abdominal obesity



<0.001
    아니오 13,892 (67.8%) 5,121 (64.0%) 7,881 (70.0%) 890 (72.4%)
    예 6,465 (32.2%) 2,861 (36.0%) 3,265 (30.0%) 339 (27.6%)
Elevated blood pressure



<0.001
    아니오 14,166 (70.9%) 5,326 (67.9%) 7,908 (72.1%) 932 (78.0%)
    예 6,191 (29.1%) 2,656 (32.1%) 3,238 (27.9%) 297 (22.0%)
Elevated fasting glucose



<0.001
    아니오 13,717 (68.5%) 5,133 (65.6%) 7,674 (69.6%) 910 (76.2%)
    예 6,640 (31.5%) 2,849 (34.4%) 3,472 (30.4%) 319 (23.8%)
Elevated triglycerides



<0.001
    아니오 13,234 (65.3%) 4,988 (62.7%) 7,365 (66.4%) 881 (72.9%)
    예 7,123 (34.7%) 2,994 (37.3%) 3,781 (33.6%) 348 (27.1%)
Low HDL cholesterol



0.002
    아니오 14,103 (71.1%) 5,414 (69.6%) 7,810 (71.7%) 879 (74.4%)
    예 6,254 (28.9%) 2,568 (30.4%) 3,336 (28.3%) 350 (25.6%)
Waist circumference, cm 83.4 ± 11.4 84.5 ± 11.3 82.9 ± 11.2 81.3 ± 11.8 <0.001
Systolic BP, mmHg 115.9 ± 14.1 116.7 ± 14.0 115.6 ± 14.1 114.4 ± 13.7 <0.001
Diastolic BP, mmHg 75.3 ± 10.0 76.0 ± 10.0 75.0 ± 9.9 73.8 ± 9.9 <0.001
Fasting glucose, mg/dL 98.7 ± 21.0 99.9 ± 22.2 98.1 ± 20.1 96.2 ± 20.8 <0.001
Triglycerides, mg/dL 131.2 ± 108.0 134.7 ± 106.5 129.6 ± 108.6 123.0 ± 112.2 <0.001
HDL cholesterol, mg/dL 55.2 ± 14.5 54.8 ± 14.5 55.4 ± 14.4 56.7 ± 15.0 <0.001
1 Mean ± SD; n (unweighted) (%)
2 Design-based KruskalWallis test; Pearson’s X^2: Rao & Scott adjustment