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A, Pa,O2vs. A-aDO2; r = 0.93*, y = −0.971 x+ 115.4; B, Pa,O2vs. Pa,CO2; r = 0.62*, y = −2.15 x+ 154.4; n = 29; *P < 0.05. A similar relationship (r = 0.62) was also observed between 
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and Pa,O2 at (not shown).
