Table 2 . Demographic characteristics of patients .

	Atrial fibrillation		No atrial fibrillation
	N	%	N	%	P
Age(year, mean±SD)	171(59.8±11.9)	13.6	1082(54.4±16.1)	86.4	0.000
Female	55	14.1	335	85.9	0.407
Smoking	53	10.5	451	89.5	0.005
DM	34	13.2	223	86.8	0.462
COPD	19	12.3	136	87.7	0.348
CVA	7	18.9	30	81.1	0.232
Prior Ml	51	15.2	284	84.8	0.185
Prior heart surgery	2	7.4	25	92.6	0.265
HTN	19	19.1	81	80.9	0.074
Renal failure(cr≥2.5)	21	18.8	91	81.3	0.071
B-blocker use	133	13.8	833	86.2	0.364
Digoxin use	20	18.9	86	81.1	0.068
Amiodarone	3	25.0	9	75.0	0.215
Diuretics	30	17.6	140	82.4	0.062
Calcium channel blocker	62	15.8	331	84.2	0.071
Cr=Creatinine; COPD = Chronic Obstructive Pulmonary Disease; CVA= Cerebrovascular Accident; DM = Diabetes Mellitus; HTN=Hypertention≥140/90; Ml = Myocardial Infarction.