Table 3.

Amplitude of Type 1 ECGs in Each Group

Variable	Group VF	Group SY	Group AS	P Value
Averaged late R′, mV	0.47±0.23	0.50±0.19	0.48±0.19	NS
Averaged S, mV	0.52±0.38	0.74±0.45	0.79±0.38	<0.01
Averaged late R′ plus S, mV	1.00±0.40	1.25±0.49	1.27±0.44	<0.05
Minimum late R′, mV	0.30±0.14	0.38±0.16	0.34±0.14	NS
Minimum S, mV	0.40±0.32	0.59±0.44	0.64±0.37	<0.05
Minimum late R′ plus S, mV	0.76±0.36	1.03±0.48	1.04±0.40	<0.01

Values are mean±SD. AS indicates patients without any symptoms; NS, not significant; SY, patients with a previous syncope episode; VF, patients with documented ventricular fibrillation.