Arterial oxygen content (CaO 2 ) showed a protective trend, although this did not reach statistical significance in the multivariable model (HR 0.82; 95% CI 0.63–1.08; P =0.16).
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Why Is PaO<sub>2</sub> Not Enough? Arterial Oxygen Content as a Prognostic Indicator in COPD Patients.
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