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Association between β-blockers treatment and 28-day mortality in subgroups. Model 1: adjusted by basic heart rate, mean arterial pressure and temperature. Model 2: further adjusted by mechanical ventilation and renal replacement therapy on model 1. Model 3: further adjusted by platelets, PaO2/FiO2 and lactate on model 2. OR, odds ratio; CI, confidence interval; ICU, intensive care unit; CCU, cardiac care unit; MV, mechanical ventilation; SOFA, sequential organ failure assessment.
