Although the nonlinearity test did not reach statistical significance ( p = .242), the overall trend still highlighted that a lower P/F ratio was associated with a higher risk of 28-day mortality, reinforcing the prognostic relevance of impaired oxygenation in septic patients.
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Comorbidity of PaO<sub>2</sub>/FiO<sub>2</sub> and nonthyroidal illness syndrome synergistically predicts 28-day mortality in sepsis: A retrospective cohort study from the MIMIC-IV database.
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