Table 2.

Echocardiographic ratio indices for Boxers versus non-Boxer dogs.

ERI Variable	Boxers (n = 81)	Non-Boxers (n = 47)	P
wLVIDd	1.58 (1.21–1.90)	1.65 (1.31–1.86)	.378
WIVSd	0.50 (0.36–0.63)	0.43 (0.28–0.58)	<.001
WLVWd	0.49 (0.38–0.58)	0.41 (0.29–0.57)	<.001
WIVSs	0.66 (0.35–1.03)	0.60 (0.44–0.79)	.001
WLVIDs	1.01 (0.68–1.35)	1.08 (0.79–1.37)	.130
WLVWs	0.68 (0.52–0.87)	0.62 (0.43–0.77)	<.001
wAo	0.91 (0.74–1.08)	0.99 (0.81–1.43)	<.001
wLA	1.00 (0.80–1.30)	1.01 (0.80–1.27)	.607
wLVODd	2.55 (2.23–3.05)	2.46 (2.15–2.83)	.002
wLVODs	2.36 (2.05–2.80)	2.27 (1.98–2.58)	.002
wWTd	0.98 (0.75–1.17)	0.86 (0.68–1.12)	<.001
wWTs	1.35 (0.88–1.82)	1.22 (0.98–1.55)	<.001
wΔA	1.48 (0.87–2.20)	1.44 (0.79–2.11)	.767
wWAd	4.08 (2.78–5.78)	3.44 (2.67–5.08)	<.001
wWAs	4.57 (3.13–6.53)	4.06 (3.09–5.17)	<.001
FS	0.37 (0.21–0.51)	0.34 (0.25–0.50)	.130
FWTd	0.38 (0.31–0.48)	0.34 (0.28–0.44)	<.001
FWTs	0.57 (0.39–0.71)	0.53 (0.43–0.66)	<.001
FWAd	0.62 (0.52–0.73)	0.57 (0.48–0.69)	<.001
FWAs	0.81 (0.63–0.91)	0.78 (0.67–0.88)	<.001

All data are presented as median (range).

See Appendix 1 for further explanation of ERI terminology and calculations.

ERI, echocardiographic ratio index; w, weight-based; LVID, left ventricular internal dimension; IVS, interventricular septum; LVW, left ventricular wall; Ao, standard aortic root; LA, left atrial; LVOD, left ventricular outer dimension; WT, wall thickness; DA, change in left ventricular internal area; WA, wall area; FS, fractional shortening; FWT, fractional wall thickness; FWA, fractional wall area. Letters s and d refer to systolic and diastolic determinations, respectively.