Table 3.

Deviations of CT abnormality scores for lung parenchymal abnormalities.

	Emphysema	GGOa	Reticular	Micronodules	Bronchiectasis	Nodulesb
Standard dose
Apex level	0.70 ± 1.20	1.14 ± 1.35	1.63 ± 1.47	0.76 ± 1.30	0.79 ± 1.31	0.49 ± 1.11
Aortic arch level	0.64 ± 1.17	1.21 ± 1.42	1.45 ± 1.49	0.92 ± 1.38	1.10 ± 1.41	0.59 ± 1.19
Carina level	0.58 ± 1.15	1.91 ± 1.40	1.89 ± 1.43	1.05 ± 1.41	1.25 ± 1.44	0.81 ± 1.34
Inferior PV level	0.93 ± 1.35	2.05 ± 1.35	2.01 ± 1.37	0.66 ± 1.20	1.28 ± 1.46	0.90 ± 1.38
Hepatic vein level	0.72 ± 1.23	1.89 ± 1.37	1.77 ± 1.43	0.64 ± 1.18	0.81 ± 1.31	0.41 ± 1.03
Low dose
Apex level	0.86 ± 1.36	1.09 ± 1.32	1.68 ± 1.50	0.99 ± 1.49	0.80 ± 1.32	0.60 ± 1.23
Aortic arch level	0.73 ± 1.29	1.18 ± 1.40	1.48 ± 1.49	1.05 ± 1.46	1.13 ± 1.43	0.51 ± 1.08
Carina level	0.72 ± 1.33	1.94 ± 1.40	1.97 ± 1.42	1.06 ± 1.41	1.40 ± 1.51	0.81 ± 1.34
Inferior PV level	1.12 ± 1.48	2.19 ± 1.32	2.06 ± 1.36	0.84 ± 1.40	1.43 ± 1.50	0.84 ± 1.32
Hepatic vein level	0.92 ± 1.42	2.07 ± 1.37	1.69 ± 1.44	0.72 ± 1.29	1.36 ± 3.97	0.50 ± 1.16
p-valuec
Apex level	0.312	0.908	0.705	0.151	0.957	0.463
Aortic arch level	0.762	0.758	0.810	0.426	0.854	0.637
Carina level	0.386	0.836	0.603	0.997	0.393	1.000
Inferior PV level	0.314	0.279	0.649	0.268	0.321	0.684
Hepatic vein level	0.299	0.201	0.565	0.649	0.082	0.530

The score deviation of a reader is defined as the reader’s score (low dose CT or standard dose CT) minus mean of the standard dose CT scores by the two other readers.

^aGGO, ground-glass opacity.

^bNodules measuring >5 mm.

^cWilcoxon signed rank test.