Table 3.

Differences between Peak T‐Wave Alternans (TWA) Values during Treadmill Exercise from Healthy Subjects and Implantable Cardioverter‐Defibrillator (ICD) Patients and Their Distribution Patterns among Group Leads (Limb, Precordial, Orthogonal)

Distribution of Maximum Peak TWA (μV) during Treadmill Exercise by Group of Leads	Healthy Subjects		ICD Patients
	N	Mean ± SD (min – max)	N	Mean ± SD (min – max)
Limb leads	7	21 ± 14 (7–43)	6*	47 ± 18 (18–69)a
Precordial leads	15	32 ± 12 (14–61)	16*	31 ± 16 (4–58)
XYZ leads	9	18 ± 9 (4–30)	10*	41 ± 25 (20–101)b

^aP = 0.018 compared to healthy subjects (Mann‐Whitney test).

^bP = 0.011 compared to healthy subjects (Mann‐Whitney test).

*P = N.S. compared to healthy subjects (chi‐square test).