Table 1.

Baseline characteristics of patients with low or high coronary collateralization

Parameter	Low collateralization group (n=186)	High collateralization group (n=292)	P value
Age (year)	66±10	64±11	0.07
Age ≥65 years	102 (55.7%)	136 (46.1%)	0.04
Male	130 (71%)	233 (79%)	0.048
Cardiovascular risk factors
Smoking	69 (37.1%)	113 (38.3%)	0.72
Hypertension	115 (61.8%)	209 (71.6%)	0.026
Hyperlipidemia	107 (57.5%)	112 (38.4%)	<0.001
Diabetes mellitus	83 (45.4%)	75 (25.4%)	<0.001
Systolic blood pressure (mmHg)	136±17	140±16	0.008
Diastolic blood pressure (mmHg)	82±10	85±8	0.001
Triglyceride (mmol/L)	1.91±1.19	1.79±0.99	0.06
Total cholesterol (mmol/L)	4.37±1.43	4.14±1.12	0.05
HDL-C (mmol/L)	0.98±0.25	1.05±0.26	0.02
LDL-C (mmol/L)	2.69±1.40	2.57±0.89	0.20
Apoprotein-A (g/L)	1.22±0.25	1.19±0.23	0.45
Apoprotein-B (g/L)	1.00±0.33	0.88±0.27	0.009
Lipoprotein (a) (g/L)	0.24±0.19	0.24±0.21	0.57
Fasting glucose (mmol/L)	6.02±1.97	5.39±1.39	<0.001
HbA1c (%)	6.44±1.10	6.19±1.11	<0.001
BUN (mmol/L)	5.50±1.95	5.07±1.65	0.001
Creatinin (μmol/L)	82.8±19.8	80.8±27.3	0.003
Uric acid (μmol/L)	339±80	328±79	0.15
eGFR<60 ml/(min∙1.73 m2)	48 (26.2%)	36 (12.2%)	<0.001
High-sensitivity CRP (mg/L)	5.85±3.01	5.28±2.71	0.03
Medications
Oral antiplatelet	168 (100%)	292 (100%)	1.00
ACEI	79 (42.5%)	138 (47.3%)	0.30
β-blockers	86 (46.2%)	121 (41.4%)	0.31
Nitrates	48 (25.8%)	72 (25.7%)	0.77
Calcium antagonists	23 (28.4%)	15 (25.0%)	0.653
Statins	175 (94.1%)	285 (97.6%)	0.89
Number of significant CAD			0.004
1-vessel disease	51 (27.9%)	58 (19.7%)
2-vessel disease	53 (29.0%)	129 (43.7%)
3-vessel disease	79 (43.2%)	108 (36.6%)

Values are expressed as mean±SD or number of patients (percentage). Chi-square for categorical variables. HDL-C: high-density lipoprotein cholesterol; LDL-C: low-density lipoprotein cholesterol; HbA1c: glycosylated hemoglobin; BUN: blood urea nitrogen; eGFR: estimated glomerular filtration rate; CRP: C-reactive protein; ACEI: angiotensin-converting enzyme inhibitor; CAD: coronary artery disease