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Table 1 Basic characteristics of the study population by sex

From: Association of sleep duration with apolipoproteins and the apolipoprotein B/A1 ratio: the China health and nutrition survey

  Men Women  
Characteristic n = 3463 n = 3918  
Age (years) 50.1 (39.3–59.6) 49.9(40–59.3) 0.586
Education < high school (%) 71.3 79.2 0.0001
Rural region (%) 68.7 67.4 0.236
Current smoking (%) 56.1 3.7 0.0001
Drinking (%) 61.6 9.3 0.0001
Medical history
 Hypertension (%) 11.7 12.6 0.245
 Diabetes (%) 3.4 2.2 0.003
Systolic blood pressure (mmHg) 121(113–133) 120(110–131) 0.0001
Diastolic blood pressure (mmHg) 81(75–89) 80(71–85) 0.0001
BMI (kg/m2) 23.2 (21–25.5) 23.1(21–25.6) 0.969
WC (cm) 84(77–91) 80(74–88) 0.0001
FPG (mg/dl) 92.3(84.9–102.1) 91.4(84.6–99.9) 0.001
HbA1c (%) 5.5(5.2–5.8) 5.5(5.2–5.8) 0.232
Hs-CRP (mg/l) 1(1–2) 1(0–2) 0.0001
Uric acid (mg/dl) 5.7(4.8–6.8) 4.3(3.6–5.2) 0.0001
Total cholesterol (mg/dl) 182.9(160.1–208.4) 185.2(160.5–212.7) 0.014
Triglycerides (mg/dl) 116(77.9–189.5) 108.1(74.4–162.1) 0.0001
HDL-C (mg/dl) 50.7(42.5–60.7) 55.3(47.1–64.6) 0.0001
LDL-C (mg/dl) 110.6(88.9–133) 113.3(90.9–138.8) 0.0001
ApoA1(mg/dl) 1.07(0.92–1.27) 1.12(0.97–1.3) 0.0001
ApoB (mg/dl) 0.88(0.72–1.07) 0.88(0.71–1.07) 0.563
Apo B/Apo A1 0.81(0.63–1.03) 0.76(0.6–0.96) 0.0001
LPA (mg/dl) 7.2(3.5–15.3) 8.4(4.5–17.8) 0.0001
Sleep duration (hours) 8(7–8) 8(7–8) 0.053
  1. BMI: body mass index; WC: waist circumference; FPG: fast plasma glucose; HbA1c: haemoglobin A1c; Hs-CRP: hs-C-reactive protein; HDL-C: high density lipoprotein cholesterol; LDL-C: low density lipoprotein cholesterol; ApoB: apolipoprotein B; ApoA1: apolipoprotein A1; LAP: lipid accumulation product