Table 4

Simple Cox regression analysis of each variable at baseline and during follow up

Variable	Baseline		3 years		6 years
Variable	Wald (χ²)	p Value	Wald (χ²)	p Value	Wald (χ²)	p Value
Cardiac death is the dependant variable.
*Significant difference (p<0.05).
QTcmax	17.47	<0.001*	23.29	<0.001*	18.01	<0.001*
QTD	6.75	<0.05*	18.88	<0.001*	12.22	<0.001*
RR interval	1.38	0.241	0.38	0.537	1.70	0.537
ABPI	0.81	0.369	13.51	<0.001*	3.39	0.066
RR ratio	1.01	0.316	0.70	0.402	4.58	<0.05*
Systolic BP	5.32	<0.05*	10.49	<0.05*	8.40	<0.05*