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Table 2 Comparison of airway lumen area at inspiratory and expiratory CT between the supine and standing positions

From: Differences in airway lumen area between supine and upright computed tomography in patients with chronic obstructive pulmonary disease

Generation Supine Standing p value
IAA
 Trachea 354.1 (316.1–396.7) 368.6 (328.5–400.3) 0.0003
 Main bronchus 195.4 (176.2–229.2) 204.9 (188.4–231.7) 0.0098
 3rd 115.3 (97.9–141.0) 120.5 (98.9–147.4) 0.0359
 4th 48.2 (38.1–58.6) 47.1 (36.4–61.4) 1.0000
 5th 24.4 (18.2–27.8) 23.6 (17.1–31.2) 0.996
 6th 11.7 (9.5–17.8) 11.6 (9.1–16.4) 0.1852
EAA
 Trachea 300.7 (269.4–332.9) 329.8 (294.4–355.7)  < 0.0001
 Main bronchus 147.5 (91.6–175.1) 184.3 (160.8–206.9)  < 0.0001
 3rd 69.8 (48.5–92.0) 82.6 (67.3–109.0)  < 0.0001
 4th 23.5 (14.5–35.0) 30.0 (21.0–36.3) 0.0063
 5th 9.7 (4.8–14.6) 12.6 (8.5–18.6) 0.0006
 6th 3.2 (1.5–6.4) 5.2 (2.7–8.3) 0.0018
EAA/IAA
 Trachea 0.84 (0.76–0.90) 0.90 (0.84–0.95)  < 0.0001
 Main bronchus 0.74 (0.50–0.85) 0.87 (0.80–1.00)  < 0.0001
 3rd 0.65 (0.42–0.77) 0.78 (0.59–0.90)  < 0.0001
 4th 0.52 (0.35–0.68) 0.62 (0.45–0.78) 0.0059
 5th 0.40 (0.22–0.53) 0.53 (0.33–0.78) 0.0002
 6th 0.29 (0.15–0.45) 0.45 (0.22–0.66) 0.0002
  1. Data are presented as medians (IQR). IAA, inspiratory airway lumen area; EAA, expiratory airway lumen area; EAA/IAA; expiratory airway lumen area/inspiratory airway lumen area ratio