Table 1 Demographic and Clinical features and laboratory findings of studied patients

Age (years)

47 (14–85)

34 (16–77)

54.5 (14–85)

0.002

Gender (male)

66 (52.8)

13 (48.15)

53 (54.08)

0.665

Comorbidities

30 (24.0)

2 (7.41)

28 (28.57)

0.039

Current smoker

38 (30.4)

6 (22.22)

32 (32.65)

0.57

Symptoms

 Fever

110 (88.0)

25 (92.59)

85 (86.73)

0.521

  Duration from onset (days)

3 (2–5)

4 (3–5.5)

3 (2–5)

0.013

 T_max (°C)

39.06 ± 0.58

39.22 ± 0.57

39 ± 0.58

0.113

 Cough

114 (91.2)

27 (100.00)

87 (88.78)

0.119

 Sputum production

83 (66.4)

20 (74.07)

60 (61.22)

0.37

 Dyspnea

22 (17.6)

7 (25.93)

15 (15.31)

0.253

 Chest pain

17 (13.6)

4 (14.81)

13 (13.27)

0.761

 Digestive symptoms

11 (8.8)

5 (18.52)

6 (6.12)

0.052

 Heart rate/min

85.36 ± 18.07

96.7 ± 16.71

85.16 ± 11.27

0.000

 Respiratory rate/min

22.32 ± 12.38

20 ± 1.78

20.13 ± 2.86

0.819

Laboratory findings

 White blood cell (10⁹/L)

8.78 ± 4.16

8.16 ± 3.11

8.94 ± 4.4

0.386

 Neutrophil (%)

71.73 ± 12.10

71.11 ± 9.3

71.89 ± 12.8

0.77

 Lymphocyte (%)

19.39 ± 9.99

18.5 ± 7.14

19.6 ± 10.64

0.614

 Hematocrit (%)

42.15 ± 28.86

39.86 ± 4.7

42.7 ± 32.29

0.659

 Hemoglobin (g/L)

132.54 ± 20.72

135.68 ± 16.05

131.71 ± 21.78

0.387

 Platelet (10⁹/L)

207.77 ± 68.55

192.77 ± 50.94

211.76 ± 72.21

0.211

 ESR (mm/hr) n = 85

41.51 ± 26.14

40.05 ± 26.19

41.92 ± 26.31

0.785

 C-reactive protein (mg/L) n = 83

66.78 ± 65.65

63.75 ± 51.97

67.74 ± 69.78

0.841

Antibiotic usage before admission within 1 week

77 (61.6)

18 (66.67)

59 (60.2)

0.657

Site of care (n = 125)

0.667

 Outpatient

51 (40.8)

10 (37.04)

41 (41.84)

 Hospitalization

74 (59.2)

17 (62.96)

57 (58.16)

Duration of hospitalization (days)

14 (10–18)

13 (6.5-19)

14 (11–18)

0.549

Days after onset at the IgM testing

4 (1–7)

4 (2–7)

3.5 (1–7)

0.246