Table 1: Patients Characteristics in the Validation Population*

Characteristics Validation Population n=511 Patients
Age ≥ 40 yr 450 (88.1%)
Anticipated death within 5 yr 244 (47.7%)
Non aspiration pneumonia 408 (79.8%)
Chest radiograph involvement > 1 lobe 224 (43.8%)
ARF requiring immediate invasive MV 312 (61.1%)
Septic shock 132 (25.8%)
HA-LRT superinfections 78 (15.3%)
Non-specific complications 152 (29.8%)
Sepsis-related complications 119 (23.2%)

ARF = acute respiratory failure; MV = mechanical ventilation; HA-LRT = hospital-acquired lower respiratory tract superinfections.
* Data are presented as No. (%).