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Table 1 Density values of the ground-glass opacities and visually unaffected tissue and their difference from 22 clinical images

From: A phantom study to optimise the automatic tube current modulation for chest CT in COVID-19

Group Mean Standard deviation 95% confidence interval p value
Ground-glass opacity regions −616.6 99.0 −662.9, −570.2 < 0.001
Visually unaffected tissue −917.0 37.5 −934.5, −899.5
Difference −300.5 −349.2, −251.7
  1. Data are given as HU