TABLE 5.

Results of the linear regression analyses describing how log₁₀ of selected linear chamber measurements relate to log₁₀ body weight in 100 healthy North American whippets.

Echo measurement	a	SE of Y estimate	Scaling exponent b	SE of b	R 2
IVSd (n = 97)	.55	.100	.222	.085	.07
LVIDd (n = 97)	1.51	.064	.332	.054	.28
LVWd (n = 97)	.35	.109	.335	.092	.12
LVIDs (n = 97)	.89	.089	.433	.076	.26
LADLax (n = 99)	1.20	.061	.391	.052	.37

Note: The constants derived permit the calculation normalized echocardiographic linear measurements for any body weight (in kg) using the equation: measured linear dimension (in cm)/body weight (in kg) ^b , where b is the scaling exponent respective to each index. All correlations were statistically significant (P < .05).

Abbreviations: Ao, aortic valve; IVS, interventricular septum; LA, left atrium; LV, left ventricle; MV, mitral valve; NS, association was not significant; PV, pulmonic valve; SMOD, Simpson's method of discs; TDI, tissue Doppler imaging; 2‐D, 2‐dimensional imaging.