Table 2 Laboratory and radiology findings at admission

 White blood cell count (×10*9/L)

6.33 (4.89–8.50)

6.27 (4.80–8.41)

6.63 (5.16–8.97)

   - > 10

45/315 (14.29)

31/236 (13.14)

14/79 (17.72)

   - < 4

37/315 (11.75)

25/236 (10.59)

12/79 (15.19)

   - Not measured

4

2

2

 Lymphocyte count (×10*9/L)

0.75 (0.49–1.12)

0.81 (0.53–1.21)

0.63 (0.32–0.92)

   - < 1

211/314 (67.20)

150/236 (63.56)

61/78 (78.21)

   - Not measured

5

2

3

 Platelet count (×10*9/L)

191 (157–254)

196 (162–255)

171 (126–243)

   - < 150

71/316 (22.47)

42/237 (17.72)

29/79 (36.71)

   - Not measured

3

1

2

 C-reactive protein (mg/L)

76 (31–130)

68 (28–110)

96 (46–160)

   - Not measured

7

4

3

 Lactate dehydrogenase (U/L)

320 (250–420)

300 (230–400)

390 (280–475)

   - Not measured

42

33

9

 Ferritin (ug/L)

840 (390–1600)

735 (370–1500)

1200 (490–2100)

   - Not measured

90

62

28

 D-dimer (mg/L)

0.83 (0.53–1.41)

0.78 (0.51–1.28)

1.06 (0.62–1.67)

   - > 0.5 mg/L

185/237 (78.06)

133/177 (75.14)

52/60 (86.67)

   - Not measured

82

61

21

 Aspartate aminotransferase (U/L)

39 (28–56)

39 (26–54)

41 (31–60)

   - Not measured

12

7

5

 Alanine aminotransferase (U/L)

28 (20–43)

28 (20–43)

28 (20–43)

   - Not measured

13

8

5

 Gamma-glutamyl transferase (U/L)

45 (26–87)

46 (25–86)

42 (27–87)

   - Not measured

22

14

8

 Alkaline phosphatase (U/L)

68 (57–93)

67 (57–93)

70 (58–90)

   - Not measured

28

19

9

 Total bilirubin (mg/dl)

0.49 (0.38–0.68)

0.49 (0.38–0.67)

0.56 (0.38–0.72)

   - Not measured

24

15

9

 Creatinine (mg/dl)

0.99 (0.79–1.31)

0.94 (0.76–1.17)

1.24 (0.92–2.21)

   - Not measured

9

7

2

 eGFR (mL/min/1.73 m*2)^b−

70 (48–87)

74 (58–91)

48 (25–71)

   - Not measured

10

8

2

 Sodium (mmol/L)

137 (135–140)

137 (134–139)

138 (135–141)

   - Not measured

7

5

2

 Potassium (mmol/L)

3.94 (3.60–4.26)

3.91 (3.60–4.26)

3.97 (3.58–4.26)

   - Not measured

7

5

2

 pH

7.48 (7.45–7.51)

7.48 (7.45–7.52)

7.47 (7.43–7.48)

  - Not measured

69

50

19

 pO2 without suppl oxygen (mmHg)

63 (55–71)

64 (56–73)

58 (50–67)

   - Hypoxemia^a — no. (%)

212/241 (87.97)

158/183 (86.34)

54/58 (93.10)

   - Not measured

78

55

23

 pCO2 (mmHg)

31 (28–34)

31 (28–35)

31 (28–34)

   - Not measured

78

55

23

 Lactate

1.50 (1.10–1.90)

1.40 (1.10–1.80)

1.60 (1.30–2.30)

   - Not measured

119

95

24

 Infiltrates on chest X-ray

205/292 (70.21)

154/220 (70.00)

51/72 (70.83)

   - Unilateral

64/292 (21.92)

49/220 (22.27)

15/72 (20.83)

   - Bilateral

140/292 (47.95)

104/220 (47.27)

36/72 (50.0)