Table 2.

Association of Electrogram Abnormalities with Signal Intensity Z Scores and IIR defined Atrial Substrate

	Beta Coefficient	Standard Error	Z	P> |z|	Lower 95% CI	Upper 95% CI
Total population, n=40
Bipolar voltage (mV)	−0.027	0.006	−4.48	<0.001	−0.039	−0.015
Delayed atrial electrogram activation	0.003	0.001	5.41	<0.001	0.002	0.004
Atrial electrogram fractionation	0.006	0.004	1.65	0.1	−0.001	0.013
Ablation-naïve group, n=24
Bipolar voltage (mV)	−0.004	0.009	−0.44	0.7	−0.021	0.014
Delayed atrial electrogram activation	0.002	0.001	1.63	0.1	<−0.001	0.004
Atrial electrogram fractionation	0.012	0.006	2.13	0.03	0.001	0.024
Redo ablation group, n=16
Bipolar voltage (mV)	−0.049	0.009	−5.42	<0.001	−0.067	−0.032
Delayed atrial electrogram activation	0.004	0.001	4.85	<0.001	0.002	0.005
Atrial electrogram fractionation	0.001	0.005	0.2	0.8	−0.009	0.01
Left atrium LGE (IIR >1.2)
Total population, n=40
Delayed atrial electrogram activation	0.024	0.002	14.39	<0.001	0.021	0.027
Atrial electrogram fractionation	0.008	0.006	1.36	0.2	−0.004	0.02
Ablation-naïve group, n=24
Delayed atrial electrogram activation	<−0.001	0.001	−0.53	0.6	−0.001	0.001
Atrial electrogram fractionation	0.035	0.008	4.55	<0.001	0.02	0.051
Redo ablation group, n=16
Delayed atrial electrogram activation	0.04	0.004	10.92	<0.001	0.033	0.047
Atrial electrogram fractionation	−0.005	0.011	−0.48	0.6	−0.026	0.016

IQR: interquartile range; CI: confidence interval