Admission characteristics
| (n=200) | ICU (n=77) | Non-ICU (n=123) | ICU versus non-ICU | |
| Inpatient (%) | 89.5 | |||
| Length of stay (days) (median ±IQR) | 9±15 | 20±20 | 4±7 | p<0.001 |
| Oxygen therapy (%) | 139 (69.5) | 77 (100.0) | 62 (50.4) | |
| Maximum required FiO2 (%) | n (%) | |||
| 21 | 61 (30.5%) | 0 (0.0) | 61 (49.6) | |
| 24–36 | 53 (26.5%) | 5 (6.5) | 48 (39.0) | |
| 40%–60% | 35 (17.5%) | 21 (27.3) | 14 (11.4) | |
| >60% | 51 (25.5%) | 51 (66.2) | 0 (0.0) | |
| Invasive mechanical ventilation (%) | 55 (27.5) | 55 (71.4) | na | |
| Inpatient systemic steroid treatment, oral or intravenous (%) | 29 (14.5) | 21 (27.3) | 8 (6.5) | |
| Peak d-dimer (0.00–0.55 mg/L) | 3.5±10.6 | 19.9±25.9 | 3.1±10.5 | p<0.001 |
| Peak ferritin (30–400 μg/L) (median ±IQR) | 1360±1450 | 2492±1518 | 775±1206 | p<0.001 |
| Nadir lymphocyte (1.2–3.5×109/L) (median ±IQR) | 0.70±0.30 | 0.6±0.3 | 0.9±0.5 | p<0.001 |
| Peak C reactive protein (0–4 mg/L) (median ±IQR) | 241.0±235 | 304.5±211 | 102.0±162 | p<0.001 |
FiO2, fractional inspired oxygen; ICU, intensive care unit.