Correlation analysis between selected percentiles of multidetector computed tomography (MDCT) attenuation histogram and visual scores (VSs).

Summary of correlation analysis between visual scores (VSs) and selected percentiles obtained from multidetector computed tomography (MDCT) attenuation histogram at initial MDCT and at 1-year follow-up. Pearson r coefficients were calculated for overall extent of abnormalities (OE), ground-glass opacities extent (GGO), reticulations extent (RET), and honeycombing extent (HC), expressed as percent of parenchyma involved (%), with the density, expressed as Hounsfield Unit (HU), of both the 40th and the 80th percentiles obtained from the MDCT attenuation histogram at baseline. The same coefficients were obtained for longitudinal changes at 1-year (Δ) in VSs, expressed as percent per year (%/y), with the variation in density, expressed as Hounsfield Unit per year (HU/y), of both the 40th and the 80th percentiles obtained from the MDCT attenuation histogram. In bold p values statistically significant (pCorrelation analysis between selected percentiles of multidetector computed tomography (MDCT) attenuation histogram and visual scores (VSs).