Table 1. Parameters Associated With the Gradient Between Pulmonary Artery Wedge Pressure and Left Ventricular End-Diastolic Pressure in Patients With Heart Failure and Preserved Ejection Fraction.

	R Value	Regression Slope (95% CI)	p Value
Simple regression
Age, yrs	0.070	0.037 (−0.048 to 0.121)	0.390
Gender	–	−0.711 (−2.351 to 0.929)	0.393
Body mass index, kg/m2	0.374	−0.049 (−0.157 to 0.059)	0.374
Capillary partial pressure of oxygen, mm Hg	0.204	0.072 (0.013 to 0.131)	0.017
Capillary partial pressure of carbon dioxide, mm Hg	−0.200	−0.180 (−0.332 to −0.028)	0.020
Vital capacity, %	0.026	0.005 (−0.026 to 0.036)	0.763
Forced expiratory volume in 1 s, %	−0.006	−0.001 (−0.03 to 0.030)	0.942
Tiffeneau index, %	−0.048	−0.016 (−0.040 to 0.710)	0.581
Diffusion capacity of carbon monoxide, %	−0.265	−0.060 (−0.106 to −0.014)	0.011
Systolic pulmonary arterial pressure, mm Hg	0.068	0.018 (−0.025 to 0.061)	0.406
Diastolic pulmonary arterial pressure, mm Hg	0.144	−0.085 (−0.009 to 0.179)	0.077
Mean pulmonary arterial pressure, mm Hg	0.091	0.041 (−0.031 to 0.114)	0.263
Mean right atrial pressure, mm Hg	0.155	0.133 (−0.004 to 0.270)	0.057
Cardiac output, l/min	−0.084	−0.293 (−0.860 to 0.273)	0.308
Multiple regression
Diffusion capacity of carbon monoxide, %		−0.060 (−0.106 to −0.014)	0.011

Values are %, unless otherwise indicated. Bold indicates p < 0.05.