Table 1. Baseline characteristics of the participants;

Characteristics	AF (N = 401)	Controls (N = 400)	Statistical parameter	P
Age (years)	63.00±1.24	63.00±1.18	-0.026	0.979
Gender (F/M)	160/241	161/239	0.010	0.920
BMI (kg/m2)	24.32±3.54	23.38±2.80	4.163	<0.001
Hypertension (Y/N)	217/184	122/278	45.747	<0.001
Systolic blood pressure	131.6 ± 24.3	128.6± 21.5	23.712	<0.001
Diastolic blood pressure	78.7±12.1	75.3±11.8	8.403	<0.001
Diabetes (Y/N)	68/333	58/342	0.912	0.339
Hyperlipoidemia (Y/N)	90/311	57/343	8.973	0.003
CAD (Y/N)	105/296	64/336	12.477	<0.001
Smoke (Y/N)	132/269	111/289	2.530	0.112
Drink (Y/N)	144/257	138/262	0.175	0.676
Exercise (Y/N)	195/206	198/202	0.061	0.805
Tea (Y/N) (Y %)	155/246 38.65	242/158 60.5	38.233	<0.001

AF, atrial fibrillation; BMI, body mass index; CAD, coronary heart disease;