. 2019 Jul 16;33(5):1909–1920. doi: 10.1111/jvim.15562

Table 1.

Results of the linear regression analyses describing how log₁₀ of selected linear chamber measurements relate to log₁₀ body weight in 122 healthy dogs

Echocardiographic chamber measurement	Proportionality constant (a)	SE of Y estimate	Scaling exponent (b)	SE of b	R ²
LVIDd^{2DE, Lx}	1.36	0.034	0.316	0.010	0.894
LVIDd^{2DE, Sx}	1.37	0.036	0.316	0.011	0.881
LVIDd^{MM, Sx}	1.40	0.034	0.299	0.010	0.884
LVIDs^{2DE, Lx}	0.89	0.050	0.351	0.015	0.828
LVIDs^{2DE, Sx}	0.73	0.062	0.392	0.018	0.795
LVIDs^{MM, Sx}	0.73	0.062	0.387	0.018	0.790
LAD^{2DE, Lx}	1.37	0.030	0.309	0.009	0.911

Notes: The constants derived from linear regression permit the calculation of prediction intervals and 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.

Abbreviations: 2DE, two‐dimensional echocardiography; LAD, left atrial dimension; LVIDd, left ventricular internal dimension at end‐diastole; LVIDs, left ventricular internal dimension at end‐systole; Lx, long‐axis; MM, M‐mode echocardiography; Sx, short‐axis.

All correlations were statistically significant (P < .001).