Factors Associated with 28-day Critical Illness Development During the First Wave of COVID-19.

PCT and LDH associations were also reported in other studies ( 21 , 27 , 28 ). Although lymphopenia (<800/mm 3 ) and C-reactive protein (CRP) (≥30 mg/dL) remained in the model, they had borderline significance ( p =0.05 for both).

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