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. Author manuscript; available in PMC: 2015 Jan 8.
Published in final edited form as: Clin Transl Sci. 2013 Sep 6;6(6):474–480. doi: 10.1111/cts.12090

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

Abbreviations: CO: cardiac output, HR: heart rare, SV: stroke volume.