Table 3. Difference in P-Wave Voltage and Duration by IAB and Voltages Categories.

Inter Atrial Block Category	Mean P-wave Voltage (mV)	P-Value
No interatrial block	0.106 ± 0.038
Partial interatrial block	0.098 ± 0.031	<0.001
Advanced interatrial block	0.074 ± 0.029
Voltage Category	Mean P-wave Duration (ms)	P-Value
<0.10 mV	122.1 ± 18.1
0.10 - 0.20 mV	117.0 ± 16.0	0.009
>0.20 mV	105.0 ± 2.6