Table 2. Analysis of determinants for characteristic impedance for both methods by a linear regression model (stepwise, enter if P<0.05, remove if P>0.1).

Variables	Coefficient	Standard Error	P Value	R partial
Model for Asklepios Zc, adjusted R 2 = 0.2093
Gender	0.00691	0.00206	0.0008	0.07
Age, years	-0.00121	0.000128	<0.0001	-0.20
Height, cm	-0.000358	0.000116	0.0021	-0.07
BMI, kg/m^2	-0.00116	0.000179	<0.0001	-0.14
HR, bpm	-	-	-	-
PP carotid, mmHg	0.00129	0.0000638	<0.0001	0.39
Model for ARCSolver Zc, adjusted R 2 = 0.3508
Gender	0.0109	0.00121	<0.0001	0.19
Age, years	-0.000738	0.0000756	<0.0001	-0.20
Height, cm	0.000214	0.0000691	0.0020	0.07
BMI, kg/m^2	-	-	-	-
HR, bpm	-	-	-	-
PP carotid, mmHg	0.00125	0.0000381	<0.0001	0.57
Model for ARCSolver Zc–Asklepios Zc, adjusted R 2 = 0.0360
Gender	-	-	-	-
Age, years	0.000435	0.000120	0.0003	0.08
Height, cm	0.000417	0.0000784	<0.0001	0.11
BMI, kg/m^2	0.00104	0.000171	<0.0001	0.13
HR, bpm	-	-	-	-
PP carotid, mmHg	-	-	-	-

PP, pulse pressure

BMI, body mass index

HR, heart rate; gender, male = 1, female = 2.