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Multivariable logistic model with respect to in-hospital mortality. ARF: acute respiratory failure; SS: severe sepsis; COPD: chronic obstructive pulmonary disease; ABT: antibiotic empiric therapy; ERS: European Respiratory Society; OR: odds ratio; CI: confident intervals. All the variables are present vs. absent, but age (1-year change), male (vs. female) and multilobar (vs. monolobar).
