Table 1.

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

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

Data are given as HU