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Receiver operating characteristic curves for APACHE II score, LDHday 1, LDHday 3, LDHc, PSI and CURB-65 score. APACHE-II, Acute Physiology and Chronic Health Evaluation II; LDH, lactate dehydrogenase; PSI, Pneumonia Severity Index; LDHday 1, LDH level on day 1; LDHday 3, LDH level on day 3; LDHc, LDH change from day 1 to day 3 [calculated using the following formula: LDHc (%) = (LDHday 3 – LDHday 1)/LDHday 1 ×100%].
