Table 1.
Respiratory and blood gas analytical data found in the emergency department. S/F: SpO2/FiO2; P/F: pO2/FiO2; ROX index: SpO2/FiO2 to respiratory rate; DELTA (A–a): oxygen alveolar–arterial gradient. Continuous variables are expressed as mean ± standard deviation.
| All Patients (1826) | COVID-19 + (617) | COVID-19 − (843) | p-Value | |
|---|---|---|---|---|
| S/F | 449.9 ± 59.0 | 440.8 ± 69.1 | 453.3 ± 53.3 | <0.001 |
| pCO2 (mmHg) | 35.0 ± 8.5 | 33.7 ± 6.7 | 35.9 ± 10.3 | <0.001 |
| P/F | 386.6 ± 157.8 | 348.2 ± 104.2 | 400.0 ± 202.3 | <0.001 |
| HCO3 (mmol/L) | 24.7 ± 3.2 | 24.4 ± 3.8 | 24.7 ± 2.6 | 0.45 |
| LAC (mmol/L) | 1.3 ± 1.3 | 1.4 ± 1.6 | 1.2 ± 0.9 | 0.19 |
| DELTA (A–a) | 23.4 ± 33.4 | 32.2 ± 21.7 | 20.2 ± 42.6 | <0.001 |
| DELTA (A–a) expected | 18.0 ± 5.5 | 19.5 ± 4.8 | 18.3 ± 5.4 | <0.001 |
| DELTA (A–a) increase | 0.29 ± 2.0 | 0.6 ± 1.1 | 0.0 ± 2.8 | <0.001 |
| ROX index | 24.9 ± 7.7 | 23.7 ± 7.6 | 25.2 ± 7.6 | <0.001 |