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Plot of log(PVR) against log(pulmonary compliance) for IPAH, distal CTEPH, and pre-PEA CTEPH. Best-fit lines are shown for the following groups: IPAH (dashed line, r2 = 0.80), distal CTEPH (gray line, r2 = 0.77), and pre-PEA CTEPH (solid line, r2 = 0.78). Analysis of covariance showed a significant difference in the intercepts (P < 0.0001).
