Correlations between changes at 1-year in selected percentiles of MDCT attenuation histogram and visual scores.

<p>Dot plots with linear regression curves for changes in overall extent of parenchymal abnormalities plotted against density variation in the 40^th percentile of the MDCT attenuation histogram (r = 0.69, <i>p</i> < 0.001) (a), for the changes in ground-glass opacity extent plotted against density variation in the 40^th percentile of the MDCT attenuation histogram (r = 0.66, <i>p</i> < 0.001) (b), and for changes in reticulations extent plotted against density variation in 80^th percentile of the MDCT attenuation histogram (r = 0.56, <i>p</i> < 0.001) (c). (%/y = percent per year; HU/y = Hounsfield units per year; MDCT = multidetector computed tomography).