Fig 1. Plasma cytokine concentrations at baseline according to four-point ordinal categories based on oxygen at admission.

Mild, oxygen therapy with mask or nasal prongs. Severe/Critical, high-flow oxygen requirement, non-invasive ventilation, mechanical ventilation or extracorporeal membrane oxygenation, and death. IL-6, interleukine-6; IL-8, interleukine-8; MIP-1β, macrophage inflammatory proteins 1β; sCD25, soluble receptor interleukine-2; TNF-α, tumor necrosis factor α; IL-1β, interleukine-1β; IP-10, interferon γ-induced protein 10; MIP-1α, macrophage inflammatory proteins 1α; IFN-γ, interferon-gamma.