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Relationship between PaO2/FiO2 ratio, A-a O2 gradient and lung diffusion parameters and VC. Correlations with FVC and FEV1 are not shown due to the strong association with VC (r = 0.859 and r = 0.829, respectively) and between FVC and FEV1 (r = 0.884). DLco: lung diffusion capacity for carbon monoxide; VA = alveolar volume; KCO = transfer factor for carbon monoxide; VC = vital capacity.
