Table 2.
Baseline characteristics of patient data according to sleep duration
| <6 h/d (n=168) | 6–7.9 h/d (n=933) | 8–9.9 h/d (n=543) | ≥10 h/d (n=71) | P Value | |
|---|---|---|---|---|---|
| Incident cases | 25 (14.9) | 82 (8.8) | 51 (9.4) | 6 (8.5) | .100 |
| Age, y | 56.36±8.12 | 53.02±8.23 | 53.42±7.91 | 54.80±8.49 | <.001 |
| Male sex | 49 (29.2) | 342 (36.7) | 211 (38.9) | 27 (38.0) | .152 |
| Weight, kg | 58.88±9.13 | 60.22±9.12 | 60.58±9.75 | 61.01±8.42 | .183 |
| WC, cm | 81.26±8.08 | 80.70±8.41 | 81.61±8.78 | 81.68±8.59 | .223 |
| BMI, kg/m2 | 23.97±3.02 | 23.75±2.77 | 23.85±3.08 | 24.25±2.43 | .447 |
| SBP, mm Hg | 117.84±11.24 | 117.67±11.18 | 118.07±10.68 | 115.70±11.19 | .399 |
| DBP, mm Hg | 73.98±7.03 | 74.08±7.39 | 73.85±7.42 | 73.63±7.24 | .924 |
| MAP, mm Hg | 88.60±7.58 | 88.61±7.72 | 88.59±7.53 | 87.66±7.78 | .792 |
| Triglycerides, mg/dL | 129.26±129.74 | 125.23±75.65 | 131.32±77.06 | 158.86±100.15 | .010 |
| Total cholesterol, mg/dL | 203.28±36.32 | 195.29±35.03 | 198.05±36.12 | 207.17±36.66 | .004 |
| HDL‐C, mg/dL | 48.43±10.91 | 46.29±10.89 | 46.82±10.71 | 44.54±10.67 | .039 |
| LDL‐C, mg/dL | 118.60±30.90 | 114.24±30.31 | 116.33±31.10 | 124.31±29.58 | .024 |
| FBG, mg/dL | 94.80±23.54 | 92.93±16.63 | 92.39±14.94 | 98.42±40.83 | .044 |
| HOMA‐IR, U | 1.97±1.31 | 1.88±1.08 | 1.86±1.04 | 2.20±2.25 | .111 |
| hs‐CRP, mg/L | 1.900±3.681 | 1.506±3.132 | 2.178±7.512 | 1.515±2.254 | .087 |
| Regular exercise | 25/167 (15.0) | 307/931 (33.0) | 148/543 (27.3) | 14/71 (19.7) | <.001 |
| Current smoker | 23/168 (13.7) | 150/931 (16.1) | 98/541 (18.1) | 11/71 (15.5) | .513 |
| Current drinker | 52/168 (31.0) | 345/931 (37.1) | 231/538 (42.9) | 29/71 (40.8) | .027 |
| Energy intake (calorie) | 2001.19±202.08 | 2068.67±227.64 | 2075.23±218.85 | 2044.29±227.55 | .001 |
| Education levels | <.001 | ||||
| Elementary | 105/167 (62.9) | 376/930 (40.4) | 260/539 (48.2) | 42/70 (60.0) | |
| Middle school | 29/167 (17.4) | 180/930 (19.4) | 108/539 (20.0) | 10/70 (14.3) | |
| High school | 23/167 (13.8) | 234/930 (25.2) | 117/539 (21.7) | 14/70 (20.0) | |
| College | 10/167 (6.0) | 140/930 (15.1) | 54/539 (10.0) | 4/70 (5.7) | |
| Married | .376 | ||||
| Yes | 143/168 (85.1) | 836/929 (90.0) | 478/541 (88.4) | 63/71 (88.7) | |
| No | 25/168 (14.9) | 93/929 (10.0) | 63/541 (11.6) | 8/71 (11.3) | |
| Monthly income, ×104 KRW | <.001 | ||||
| <100 (low) | 92/154 (59.7) | 270/849 (31.8) | 195/476 (41.0) | 34/63 (54.0) | |
| 100–200 (medium) | 33/154 (21.4) | 255/849 (30.0) | 134/476 (28.2) | 13/63 (20.6) | |
| >200 (high) | 29/154 (18.8) | 324/849 (38.2) | 147/476 (30.9) | 16/63 (25.4) |
Data are expressed as number (percentage) or mean±standard deviation. BMI, body mass index; DBP, diastolic blood pressure; FBG, fasting blood glucose; HDL‐C, high‐density lipoprotein cholesterol; HOMA‐IR, homeostasis model assessment of insulin resistance; hs‐CRP, high‐sensitivity C‐reactive protein; LDL‐C, low‐density lipoprotein cholesterol; MAP, mean arterial pressure; SBP, systolic blood pressure; WC, waist circumference.