Table 1 Comparison of the backgrounds of patients with COVID-19 between two groups of pneumonia with high/low percentage of lung lesions on CT images at admission

Age [years]

54.3 (± 17.0)

57.6 (± 16.1)

0.001

Sex, male

527 (65.9)

308 (77.0)

< 0.001

BMI [kg/m²]

24.5 (± 6.43)

25.7 (± 5.01)

0.002

Smoking history

0.850

 Never

416 (53.8)

210 (54.4)

 Previously or currently

357 (46.2)

176 (45.6)

Medical history

 Hypertension

230 (28.8)

147 (36.8)

0.005

 Diabetes mellitus

125 (15.7)

94 (23.6)

< 0.001

 Cardiovascular disease

70 (8.8)

46 (11.6)

0.127

 Malignancy

76 (9.6)

36 (9.0)

0.749

 Autoimmune disease

58 (7.3)

21 (5.3)

0.184

 COPD

25 (3.1)

9 (2.3)

0.398

 Asthma

68 (8.6)

18 (4.6)

0.012

 Hyperuricemia

88 (11.1)

47 (11.8)

0.704

 Chronic liver disease

26 (3.3)

11 (2.8)

0.634

 Chronic kidney disease

55 (6.9)

42 (10.6)

0.032

Admission

 Days from onset to admission [days]

4.71 (± 3.00)

6.79 (± 3.73)

< 0.001

Data are as N (%) or mean (standard deviation).

Abbreviations: BMI, body mass index; COPD, chronic obstructive pulmonary disease; COVID-19, coronavirus disease.