Table 3

Comparison of CT parameters between groups

COPD subjects with severe PHCOPD subjects without severe PHp Value
N2020 
Bronchi
 WA19.06±5.1720.16±4.760.490
 Mean lumen area (mm2)11.14±4.6714.30±5.600.060
 WA%1.91±0.621.62±0.400.079
 Mean wall thickness (mm)1.22±0.141.18±0.140.401
Parenchyma
Emphysema
 Low lung attenuation area per cent11.85±14.5916.97±13.540.257
Vessels
Large vessels
 AP/AO1.04±0.130.91±0.210.022
Small vessels
 %CSA<50.52±0.190.39±0.140.019
 %CSA5-100.16±0.030.12±0.03<0.001
 CSN<50.32 (0.25–0.49)0.22 (0.19–0.36)0.034
 CSN5-100.02 (0.02–0.02)0.01 (0.01–0.02)<0.001
  • Data are means with SD for continuous normal variables, or median with IQR if their distribution is not normal. Comparisons of continuous variables were made with the t tests, or with Mann–Whitney tests for non-parametric variables.

  • %CSA<5, percentage of total lung area taken up by the cross-sectional area of pulmonary vessels less than 5 mm2; %CSA5–10, percentage of total lung area taken up by the cross-sectional area of pulmonary vessels between 5 and 10 mm2; AO, aorta; AP, pulmonary artery troncus; CSN<5, number of vessels less than 5 mm2 normalised by total lung area; CSN5-10, number of vessels between 5 and 10 mm2 normalised by total lung area; PH, pulmonary hypertension; WA, mean wall area (mm2); WA%, mean wall area percentage.