Skip to main content

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