Table 2.

Impact of notch filtering on unipolar fibrillation potential morphology. Delta values (∆ = notch filter on–notch filter off) for all parameters and corresponding p values based on the likelihood ratio test are given (* < 0.05). Potential type is either single (one deflection), double (two deflections), or complex (three or more deflections). FDT fractionation delay time

Study ID	∆ Number of detected fibrillation potentials	∆ Median deflection amplitude (mV)	∆ Singles (%)	∆ Doubles (%)	∆ Complex (%)	∆ Median FDT (ms)
1	− 42	− 0.0125	0.2728	− 0.5923	0.3196	0
2	− 76	− 0.0131	0.1949	− 0.4636	0.2686	0
3	− 132	− 0.0094	0.2474	− 0.1654	− 0.0820	0
4	0	0.0000	0.0000	0.0000	0.0000	0
5	− 213	− 0.0081	− 0.8585	0.4505	0.4080	0
6	− 140	− 0.0050	− 0.3731	0.0758	0.2973	0
7	− 61	− 0.0119	− 0.3039	− 0.6978	1.0017	0
8	14	− 0.0163	− 0.4014	0.2530	0.1484	− 1
9	− 11	− 0.0119	0.3255	− 0.4528	0.1100	0
10	− 190	− 0.0081	− 0.1262	0.0469	0.0875	0
Min–max	− 213–14	− 0.0163–0.0000	− 0.8585–0.3255	− 0.6978–0.4505	− 0.082–1.0017	− 1–0
p value	0.0043*	< 0.0001*	0.3827	0.1973	0.0157*	0.3047