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Table 1 Characteristics of the study participants according to RBP4 quartiles

From: Associations of retinol-binding protein 4 with oxidative stress, inflammatory markers, and metabolic syndrome in a middle-aged and elderly Chinese population

  Quartile of RBP4
  1 (n = 437) 2 (n = 437) 3 (n = 437) 4 (n = 437)
RBP4 (μg/ml) 20.94 ± 4.391 27.97 ± 2.64 33.71 ± 3.05 46.18 ± 8.11
Age (years) 63.89 ± 5.80 65.08 ± 4.81 65.77 ± 4.87 66.23 ± 4.77
Male [n (%)] 236 (54.0) 225 (51.5) 230 (52.6) 219 (50.1)
BMI (kg/m2) 23.49 ± 2.69 24.26 ± 2.86 24.42 ± 3.37 24.71 ± 3.16
Current smoker [n (%)] 109 (24.9) 117 (26.8) 115 (26.3) 122 (27.9)
Current drinker [n (%)] 104 (23.8) 98 (22.4) 94 (21.5) 101 (23.1)
Family history of chronic diseases [n (%)]2 127 (29.1) 117 (26.8) 129 (29.5) 121 (27.7)
Waist circumference (cm) 79.86 ± 10.65 81.48 ± 12.13 84.03 ± 11.75 85.73 ± 12.38
Waist-to-hip ratio 0.84 ± 0.09 0.87 ± 0.07 0.90 ± 0.08 0.92 ± 0.07
Systolic blood pressure (mmHg) 116.81 ± 12.01 115.26 ± 11.96 116.44 ± 11.54 116.56 ± 12.41
Diastolic blood pressure (mmHg) 73.25 ± 8.23 73.88 ± 7.47 74.15 ± 8.42 74.36 ± 8.68
Fasting glucose (mmol/l) 5.62 ± 1.44 5.81 ± 1.93 5.76 ± 1.34 6.02 ± 2.03
Insulin (μU/ml) 13.17 (9.76–16.85)3 13.32 (9.53–17.74) 13.85 (10.08–18.21) 14.36 (10.46–19.82)
HOMA-IR 3.29 (2.44–4.21) 3.44 (2.46–4.58) 3.55 (2.58–4.66) 3.84 (2.80–5.31)
Adiponectin (μg/ml) 15.18 (10.87–23.86) 13.54 (9.25–22.35) 13.79 (8.42–20.89) 13.68 (7.83–19.14)
A-FABP (μg/l) 15.38 (8.45–21.91) 15.61 (8.84–21.38) 15.85 (8.66–23.04) 16.12 (9.62–23.42)
Total cholesterol (mM) 4.67 ± 0.78 4.78 ± 0.72 4.89 ± 0.71 5.00 ± 0.58
Triglyceride (mM) 1.04 ± 0.39 1.13 ± 0.36 1.25 ± 0.42 1.35 ± 0.45
LDL cholesterol (mM) 3.06 ± 0.65 3.18 ± 0.61 3.34 ± 0.62 3.50 ± 0.56
HDL cholesterol (mM) 1.48 ± 0.33 1.42 ± 0.34 1.37 ± 0.29 1.33 ± 0.44
8-iso PGF2-α, pmol/ml 7.42 ± 2.56 7.63 ± 2.49 8.54 ± 2.77 9.32 ± 2.89
13-HODE, pmol/ml 20.2 ± 5.8 21.5 ± 7.7 22.8 ± 6.3 25.1 ± 8.4
hsCRP, μg/ml 0.77 (0.36–1.38) 0.75 (0.39–1.54) 0.82 (0.43–1.74) 0.91 (0.48–1.93)
IL-6, pg/ml 3.05 ± 1.53 3.41 ± 1.75 4.08 ± 1.66 4.43 ± 1.97
MCP-1, pg/ml 227.3 ± 74.5 269.1 ± 92.8 294.8 ± 82.3 334.7 ± 112.6
TNF-α, ng/ml 2.34 ± 0.68 2.55 ± 0.76 2.87 ± 0.82 3.19 ± 1.03
  1. 1Mean ± SD (all such values).
  2. 2Includes coronary heart disease, stroke, hypertension, and diabetes in a parent or a first-degree sibling.
  3. 3Median (interquartile range).