Table 3. Correlation between brachial and echocardiographic STIs and AUC of these STIs in the prediction of LVEF <50% in subgroup analysis.

Parameter	HR>median (68 beats/min) (n = 413)		HR<median (68 beats/min) (n = 436)		CAD (+) (n = 162)		CAD (−) (n = 687)		LVEF <50% (n = 103)		LVEF >50% (n = 746)
	r	P	r	P	r	P	r	P	r	P	r	P
bPEP and PEP (ms)	0.657	<0.001	0.630	<0.001	0.512	<0.001	0.751	<0.001	0.637	<0.001	0.589	<0.001
bET and ET (ms)	0.799	<0.001	0.780	<0.001	0.828	<0.001	0.841	<0.001	0.871	<0.001	0.834	<0.001
bPEP/bET and PEP/ET	0.724	<0.001	0.667	<0.001	0.585	<0.001	0.782	<0.001	0.686	<0.001	0.631	<0.001
	AUC for LVEF <50%				AUC for LVEF <50%
bPEP/bET	0.784		0.718		0.670		0.807
PEP/ET	0.816		0.690		0.624		0.835

Abbreviations. bPEP, brachial pre-ejection period; bET, brachial ejection time; AUC, area under curve; HR, heart rate; CAD, coronary artery disease; LVEF, left ventricular ejection fraction.