. Author manuscript; available in PMC: 2014 Jun 1.

Published in final edited form as: J Am Soc Echocardiogr. 2013 Apr 10;26(6):657–666. doi: 10.1016/j.echo.2013.02.018

Table 3.

Ascending aortic and aortic root elastic modulus and stiffness index by quartiles of age

Characteristic	n	Age < 6.0 y	n	Age 6.0–10.8 y	n	Age 10.8–15.5 y	n	Age > 15.5 y	P
Ascending aortic elastic modulus (mm Hg)	133	257 (197–338)	134	285 (221–389)	129	356 (264–454)	96	426 (324–582)	<.0001^*^†
Ascending aortic stiffness index	133	4.48 ± 2.85	134	4.61 ± 2.89	129	5.10 ± 2.57	96	5.86 ± 2.60	<.001^†
Aortic root elastic modulus (mm Hg)	152	430 (312–614)	150	581 (389–867)	147	719 (469–1040)	149	821 (537–1224)	<.0001^*^†
Aortic root stiffness index	152	6.13 (4.54–8.78)	150	7.88 (5.45–11.53)	147	8.90 (6.21–13.74)	149	9.75 (6.57–14.92)	<.0001^*^†

Data are expressed as median (IQR) or as mean ± SD.

Nonparametric P value.

^†

Statistically significant (P < .01).