35.7%) 0.004 (χ)
  6–10 6 (17.6%) 12 (42.9%)
  11–15 0 3 (10.7%)
  > 15 1 (2.9%) 3 (10.7%)
COVID-19, coronavirus disease 2019
Fig. 2 A 56-year-old male with coronavirus disease 2019 in the early-stage group. a Axial non-contrast CT shows ground-glass opacities in the anterior segments of bilateral upper lobes. b Ground-glass opacity is also shown in the