Direct Bilirubin Levels and Risk of Metabolic Syndrome in Healthy Chinese Men

Table 1

Baseline characteristics of study subjects based on serum total bilirubin quartile categories.

Variables	Bilirubin quartile catagories				for trend
	Q1 (≤11.75 μmol/L)	Q2 (11.76–14.30 μmol/L)	Q3 (14.31–18.12 μmol/L)	Q4 (>18.12 μmol/L)
	Age (years)						<0.000
BMI (kg/m^2)					0.174
Systolic BP (mmHg)					0.5
Diastolic BP (mmHg)					0.111
Current smoking (%)	35.2	21.6	17.1	18.0	<0.000
Alcohol drinking (%)	40.8	34.9	39.9	36.2	0.316
Regular exercise (%)	27.5	33.4	37.2	38.6
FBG (mmol/L)					0.039
Total cholesterol (mmol/L)					0.06
TG (mmol/L)					<0.000
HDL (mmol/L)
LDL (mmol/L)					0.211
ALT (U/L)
AST (U/L)					0.568
GGT (U/L)
Total bilirubin (μmol/L)
Direct bilirubin (μmol/L)
Indrect bilirubin (μmol/L)
White blood cell count (10^3 cells/ml)					<0.000
MetS (%)	9.6	11.0	8.1	6.3	0.134

Data are means ± SD or medians (interquartile range) for skewed variables, or proportions for categorical variables. value was calculated by ANOVA or Kruskal-Wallis test for continuous variables and chi-square test for categorical variables. MetS: metabolic syndrome; BP: blood pressure; BMI: body mass index; FBG: fasting plasma glucose, CH: Total cholesterol; TG: triglyceride; TH: total cholesterol; HDL-C: high-density lipoprotein cholesterol; LDL-C: low-density lipoprotein cholesterol; ALT: aspartate aminotransferase; AST: alanine aminotransferase; GGT: gamma-glutamyltransferase. .