| Total | Very low (≤7) | Low (8–11) | Medium (12–17) | High (≥18) | p†|
---|---|---|---|---|---|---|
Number of patients | 8293 | 1771 | 2020 | 2146 | 2356 | Â |
Sex (male, %) | 57.6% | 59.7% | 59.3% | 55.5% | 56.4% | 0.01 |
Age | Â | Â | Â | Â | Â | 0.11 |
 18–44 years | 37.9% | 36.8% | 36.5% | 40.5% | 37.4% |  |
 45–54 years | 15.7% | 15.3% | 15.6% | 15.5% | 16.3% |  |
 55–64 years | 46.4% | 47.9% | 47.8% | 44.0% | 46.3% |  |
Charlson comorbidity index | Â | Â | Â | Â | Â | 0.16 |
 0 | 43.9% | 44.0% | 42.2% | 43.1% | 46.1% |  |
 1 or 2 | 42.8% | 42.3% | 43.3% | 43.2% | 42.2% |  |
 3–6 | 11.1% | 11.2% | 12.0% | 11.4% | 10.0% |  |
 7 and above | 2.2% | 2.6% | 2.4% | 2.2% | 1.7% |  |
Referred from clinics/other hospitals | 36.9% | 36.0% | 35.6% | 42.4% | 33.5% | <.001 |
Severity Indices | Â | Â | Â | Â | Â | Â |
 BUN ≥21 mg/dL or signs of dehydration | 19.8% | 22.7% | 19.7% | 19.3% | 18.4% | 0.01 |
 SpO2 ≤ 90% (or ≤ PaO2 60 Torr) | 22.1% | 21.0% | 22.7% | 21.9% | 22.5% | 0.60 |
 Presence of cognitive disturbance | 8.0% | 8.0% | 8.0% | 8.4% | 7.6% | 0.79 |
 Systolic blood pressure ≤90 mmHg | 7.6% | 9.3% | 8.2% | 7.1% | 6.4% | 0.004 |
Academic hospital | 12.1% | 11.5% | 14.9% | 11.1% | 10.9% | <.001 |
In-hospital death | 3.3% | 3.8% | 3.6% | 3.4% | 2.6% | 0.14 |