we derived 1 ) the pulse wave velocity ( pwv ) as pw = sl/pwd where sl is the sternal length , 2 ) pwv/ad ratio as an indirect index of characteristic impedance , 3 ) th/r and lv mass ( m ) according to teichholz formula : ( table ; see text ) in both groups 1 ) m is significantly correlated with sap ( r = 0.67 p less than 0.001 ) , pp ( r = 0.61 p less than 0.001 ) , pwv ( r = 0.52 p less than 0.01 ) but not with pwv/ad ;
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characteristic