Table 1.

Baseline characteristics.

	AVNRT (N = 833)	Concealed AVRT (N = 346)	P-Value
Age (years)	48.7 ± 16.2	44.2 ± 16.2	<0.001
Men	291 (35.3)	212 (62.7)	<0.001
Heart rate (per minute)	71.0 ± 9.6	69.9 ± 11.2	0.077
PR interval (ms)	154.3 ± 24.5	153.5 ± 22.7	0.625
QRS duration (ms)	91.6 ± 12.1	93.5 ± 10.8	0.010
Corrected QT interval (ms)	427.1 ± 23.3	420.2 ± 25.4	<0.001
P axis (degree)	50.0 ± 21.3	49.8 ± 21.4	0.894
R axis (degree)	49.3 ± 34.3	53.7 ± 33.5	0.043
T axis (degree)	42.7 ± 22.7	43.3 ± 26.0	0.695
Premature atrial complex	15 (1.8)	5 (1.4)	0.667
Premature ventricular complex	8 (1.0)	8 (2.3)	0.068
Left ventricular hypertrophy	13 (1.6)	8 (2.3)	0.374
Low voltage	7 (0.8)	2 (0.6)	0.637
Early repolarization	16 (1.9)	13 (3.8)	0.064
Right atrial enlargement	6 (0.7)	8 (2.3)	0.022
Left atrial enlargement	12 (1.4)	8 (2.3)	0.291
First-degree atrioventricular block	23 (2.8)	5 (1.4)	0.177
Right bundle branch block	43 (5.2)	6 (1.7)	0.007
Left bundle branch block	0 (0.0)	0 (0.0)	>0.999
Left anterior fascicular block	7 (0.8)	1 (0.3)	0.294
Left posterior fascicular block	2 (0.2)	0 (0.0)	0.362
Bifascicular block	3 (0.4)	0 (0.0)	0.264
Any infarct	32 (3.8)	13 (3.8)	0.945
Any ischemia	20 (2.4)	12 (3.5)	0.304

Data are presented as mean ± standard deviation or N (%), with percentages calculated after excluding missing values from the denominator. Corrected QT intervals were calculated using Bazett's formula.

AVNRT: atrioventricular nodal reentry tachycardia; AVRT: atrioventricular reentry tachycardia.