Table 2.

Correlations between ambulatory arterial stiffness index and 24-hr, daytime, and nighttime ambulatory variables monitoring in 67 normotensives

	24-hr		daytime		nighttime
	r	p-value	r	p-value	r	p-value
SBP (mmHg)	0.43	<0.001	0.34	0.005	0.52	<0.001
DBP (mmHg)	-0.16	NS	-0.31	0.010	0.18	NS
MAP (mmHg)	0.10	NS	-0.06	NS	0.36	0.003
PP (mmHg)	0.58	<0.001	0.60	<0.001	0.46	<0.001
HR (bpm)	-0.09	NS	-0.07	NS	-0.13	NS
MAP variability — SD (mmHg)	-0.45	<0.001	-0.15	NS	-0.09	NS
HR variability — SD (mmHg)	-0.05	NS	-0.01	NS	-0.21	NS
Morning surge SBP (mmHg)			-0.17	NS
Morning surge DBP (mmHg)			-0.31	0.010
MAP variability — CV (%)	-0.47	<0.001	-0.13	NS	-0.17	NS
HR variability — CV (%)	-0.02	NS	0.01	NS	-0.18	NS
Nocturnal dipping in SBP (%)					-0.37	0.002
Nocturnal dipping in DBP (%)					-0.54	<0.001
Nocturnal dipping in MAP (%)					-0.51	<0.001

BP, blood pressure. SBP, systolic BP. DBP, diastolic BP. PP, pulse pressure. MAP, mean arterial pressure. HR, heart rate. SD, standard deviation. CV, coefficient of variation. r, correlation coefficient.