Table 2 Baseline characteristics of patients included in the study

Male gender

19/19

100%

Age, years

59

51 – 68

Smoking

 Current smoker

2/17

12%

 Ex-smoker

9/17

53%

 Non-smoker

6/17

35%

Body mass index (BMI), kg/m²

29.3

26.6 – 31.2

SARS-CoV-2 vaccination

 Unvaccinated

7/17

41%

 At least 1 vaccine dose

10/17

59%

Comorbidities

 No comorbidities

1/19

5%

 Hypertension

11/19

58%

 Obesity (BMI ≥ 30)

7/18

39%

 Diabetes mellitus

7/19

37%

 Chronic kidney failure

5/19

26%

 Haematologic disease

2/19

11%

 Asthma or COPD

2/19

11%

 Rheumatic disease

1/19

5%

 Sleep apnea

1/19

5%

 Paroxysmal atrial fibrillation

1/19

5%

 Other, unclassified

5/19

26%

Pre-existing DNR

2/19

11%

Long-term medication before admission

 Oral glucocorticoid

3/19

16%

 Inhaled glucocorticoid

2/19

11%

 Anti-rheumatic medication

2/19

11%

 Anticoagulants

3/19

16%

 Other medicines

18/19

95%

Findings upon admission

 Duration of symptoms before admission, days

10

3 – 14

 Peripheral oxygen saturation, %

91%

87% – 95%

 Heart rate, beats/minute

100

85 – 108

 Systolic blood pressure, mmHg

136

103 – 149

 Diastolic blood pressure, mmHg

74

59 – 84

 Leukocytes, × 10⁹/L

6.6

5.3 – 9.2

 Neutrophils, × 10⁹/L

5.3

4.5 – 6.8

 Lymphocytes, × 10⁹/L

1.0

0.6 – 1.4

 C-reactive protein, mg/L

82

57 – 151

 Ferritin, µg/L

1158

560 – 1793

 Procalcitonine, µg/L

0.21

0.12 – 0.36

 D-dimer, mg/L

0.40

0.30 – 0.80

 Interleukin-6, pg/ml

33

17–81

 Myxovirus resistance protein A > 800 µg/L

12/17

71%

 Detectable SARS-CoV-2 specific IgG

14/19

74%