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Table 2 Densitometric progression ('raw' data)

From: Detection of emphysema progression in alpha 1-antitrypsin deficiency using CT densitometry; Methodological advances

Mean ± SD

Baseline

Follow-up

Change from baseline

t

p value

Annual change

WL Perc15 (HU)

-939.09 ± 33.44

-946.16 ± 29.26

-7.06 ± 8.97

-6.64

< 0.0001

-3.53

WL VI-950 (%)

15.08 ± 10.63

17.75 ± 11.35

2.67 ± 3.34

6.74

< 0.0001

1.34

WL VI-910 (%)

36.29 ± 18.28

40.48 ± 18.06

4.18 ± 5.14

6.86

< 0.0001

2.09

  1. WL, whole lung; Perc15,15th percentile point (measured in Hounsfield Units); SD, standard deviation; VI-950, voxel index at a threshold of -950HU (measured in %); VI-910, voxel index at a threshold of -910HU (measured in %); annual change, change in outcome measure without adjustment for lung volume.