TABLE 2.
Blood gas characteristics of COVID‐19 and non‐COVID respiratory patients at admission
| COVID‐19 (n = 517) | Non‐COVID‐19 (n = 314) | p value* | |
|---|---|---|---|
| Age (years) | 70 ± 14 | 72 ± 18 | 0.06 |
| Female | 253 (48.9) | 145 (46.2) | 0.44 |
| Blood gas variables | |||
| pO2 (mmHg) | 62.8 ± 11.9 | 67.0 ± 14.5 | <0.001 |
| pCO2 (mmHg) | 34.6 ± 6.4 | 38.9 ± 8.7 | <0.001 |
| pH | 7.45 ± 0.05 | 7.42 ± 0.06 | <0.001 |
| Haemoglobin (g/dl) | 13.0 ± 1.8 | 13.0 ± 2.3 | 0.80 |
| Oxygen saturation (%) | 90.9 ± 6.4 | 90.8 ± 7.2 | 0.78 |
| Oxyhaemoglobin (%) | 90.0 ± 6.4 | 89.3 ± 8.5 | 0.16 |
| Oxygen content (ml/dl) | 16.6 ± 2.7 | 16.7 ± 3.2 | 0.97 |
| Carboxyhaemoglobin (%) | 0.5 (0.3–1.0) | 1.0 (0.6–1.6) | <0.001 |
| Methaemoglobin (%) | 0.3 (0.2–0.4) | 0.2 (0.1–0.3) | <0.001 |
| Deoxyhaemoglobin (%) | 7.1 (5.5–10.0) | 6.9 (4.7–10.7) | 0.12 |
| Base excess (mmol/L) | 0.0 (−1.4 to 1.7) | 0.0 (−2.0 to 1.9) | 0.91 |
| p50 (mmHg) | |||
| In vivo | 25.7 ± 1.4 | 27.1 ± 2.8 | <0.001 |
| <27 | 441 (85.3) | 180 (57.3) | <0.001 |
| Standardized | 26.3 ± 1.2 | 26.8 ± 2.9 | <0.001 |
| <27 | 393 (76.0) | 188 (59.9) | <0.001 |
Note: Data are mean ± SD, median (IQR) or n(%).
*
p value for comparison between groups with and without COVID‐19.