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Table 2 ICU-parameters for patients with PaO2/FiO2 ≤ 20 kPa on invasive mechanical ventilation within 24 h from ICU admission

From: Prevalence and impact of early prone position on 30-day mortality in mechanically ventilated patients with COVID-19: a nationwide cohort study

Ventilatory parameters at ICU admission (within one hour before until one hour after admission)

PaO2, kPa. Median (IQR)

8.5 (7.4–9.8)

8.6 (7.4–9.9)

8.3 (7.3–9.4)

FiO2, %. Median (IQR)

80 (70–100)

80 (65–95)

85 (70–100)

PaO2/FiO2 ratio. Median (IQR)

11.0 (8.5–14.2)

11.6 (8.8–14.8)

9.9 (8.0–12.6)

PaO2/FiO2 ratio categories. kPa

 > 13.3—≤ 26.6

525 (30.6)

415 (36.3)

110 (19.3)

 ≤ 13.3

1189 (69.4)

729 (63.7)

460 (80.7)

Treatment and vital signs at ICU admission (within one hour before until one hour after admission)

Vasopressor on admission, No (%)

107 (6.2)

73 (6.4)

34 (6.0)

Body temperature

No with data

1647

1094

553

Degrees Celsius

37.8 (37.0–38.4)

37.8 (37.0–38.5)

37.8 (37.1–38.3)

Fevera, No (%)

602 (36.6)

423 (38.6)

180 (32.5)

Systolic blood pressure, min, mmHg

No. with data

1669

1103

566

Median (IQR)

119 (95–135)

116 (95–134)

120 (100–139)

Heart rate, maximum, beats/min

No. with data

1681

1116

565

Median (IQR)

95 (82–110)

95 (80–110)

98 (84–112)

White blood cell count, × 109/L

No. with data

1638

1084

554

Median (IQR)

9.3 (6.8–12.9)

9.0 (6.5–12.6)

9.9 (7.3–13.1)

pH

No. with data

1699

1130

569

Median (IQR)

7.43 (7.35–7.47)

7.43 (7.35–7.47)

7.44 (7.36–7.48)

Creatinine, mg/dL

No. with data

1636

1085

551

Median (IQR)

72 (58–95)

71 (58–99)

72 (58–91)

Bilirubin, mg/dL

No. with data

1596

1047

549

Median (IQR)

9 (6–12)

9 (6–12)

9 (6–12)

SAPS3 at admission, median (IQR)

58 (53–65)

58 (53–65)

58 (53–66)

Predicted risk of death (SAPS3), median (IQR), %

32 (22–48)

32 (22–46)

32 (22–48)

Outcome

30-day mortality

500 (29.2)

345 (30.2)

155 (27.2)

90-day mortality

575 (33.5)

398 (34.8)

177 (31.1)

  1. IQR, interquartile range; y: years; d: days; ICU, intensive care unit; PaO2, arterial partial pressure of oxygen; FiO2, fraction of inspired oxygen; SAPS, simplified acute physiology score
  2. aFever is defined as body temperature above 38 °C