Table 2.

Results of correlation and simple linear regression analyses for the prediction of TRPG from 4 echocardiographic indices of PH in 69 dogs where TRPG could be reliably quantified

Variable	r	95% CI of r	R 2	P	Regression Equation
RPAD index	−0.90	−0.94 to −0.85	0.81	<.0001	TRPG = (−2.27 × RPAD index) + 121.5
MPA:Ao	0.78	0.67–0.86	0.61	<.0001	TRPG = (146.0 × MPA:Ao)−101.5
AT	−0.69	−0.80 to −0.54	0.48	<.0001	TRPG = (−1.06 × AT) + 120.5
AT:ET	−0.68	−0.79 to −0.53	0.46	<.0001	TRPG = (−246.5 × AT:ET) + 137.8

r, correlation coefficient; CI, confidence interval; R ², coefficient of determination; PH, pulmonary hypertension; See Table 1 for remainder for the remainder of the key.