Table 1.

Basic demographics of patients in the long R-R interval group and nonlong R-R interval group.

Groups	Male/female	Age (mean, years)	History of smoking/alcohol consumption	Hypertension/diabetes/coronary heart disease	Duration of atrial fibrillation (mean, months)
Long R-R interval (n = 399)	276/123	73.52 ± 5.69	384/384	165/108/126	14.86 ± 5.68
Nonlong R-R interval (n = 133)	84/49	74.01 ± 5.70	128/126	65/48/20	15.01 ± 5.70
χ 2/t	1.386	0.860	0.069	2.002	0.264
P	0.239	0.390	0.792	0.157	0.792