Minor criteria Respiratory rate ≥ 30 breaths/min
PaO2/FiO2 ratio ≤ 250
Multilobar infiltrates
Uremia (BUN level, ≥ 20 mg/dl)
Leukopenia (WBC count, <4000 /mm3)
Thrombocytopenia (platelet count, <100.000 /mm3)
Hypothermia (core temperature <36°C)
Hypotension requiring excessive fluid resuscitation
Major criteria Invasive mechanic ventilation
Septic shock with the need for vasopressors
*The patients who had at least 1 minor or 3 minor criterion were accepted to intensive care unit (ICU).
Table 1: Criteria for ICU need*.