Table 4.

Linear regression using cardiac index change as dependent variable and HR change or SV change as covariates

	Healthy controls	PH
HR change standardized beta coefficient	0.5	0.54
SV change standardized beta coefficient	0.59	0.82
HR change semipartial correlation	0.43	0.54
SV change semipartial correlation	0.51	0.81
HR change unique contribution to CO change (%)	18	29
SV change unique contribution to CO change (%)	26	66

CO = cardiac output; HR = heart rare; SV = stroke volume.