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Table 1 Demographic data and PFTs among normal, COPD mild, and COPD severe groups

From: Vector-field dynamic x-ray (VF-DXR) using optical flow method in patients with chronic obstructive pulmonary disease

Variables Normal (n = 47) COPD mild (n = 14) COPD severe (n = 22) p value
Median [IQR] Median [IQR] Median [IQR]
Age (years) 55 [49, 61] 77.5 [71.5, 79] 67.5 [63.5, 76.3] < 0.001
Sex, females/males 27/20 2/12 3/19 < 0.001
Height (cm) 162.3 [155, 169.6] 164.5 [161.5, 167] 164.5 [158.3, 167.5] 0.907
Weight (kg) 61.2 [51.6, 66.3] 57.9 [54.6, 62.5] 50.0 [47.0, 60.8] 0.210
BMI (kg/m2) 22.7 [20.4, 23.7] 22.6 [20.5, 23.4] 19.7 [18.0, 22.5] 0.083
Smoking History Never Current or former Current or former  
GOLD, 1/2/3/4 Not applicable 4/10/0/0 0/0/17/5  
PFT
TV (L) 0.60 [0.50, 0.98] 1.09 [0.75, 1.23] 0.84 [0.72, 0.97] 0.006
VC (L) 3.25 [2.64, 3.80] 3.11 [2.85, 3.50] 2.47 [1.94, 2.79] < 0.001
%VC 106.1 [99.9, 117.5] 104.3 [91.5, 115.2] 79.9 [68.9, 90.4] < 0.001
FEV1 (L) 2.58 [2.18, 3.19] 1.72 [1.56, 1.98] 0.93 [0.82, 1.03] < 0.001
FEV1% 81.6 [79.0, 85.7] 58.8 [53.6, 60.7] 41.2 [36.6, 44.8] < 0.001
%FEV1 105.2 [98.7, 113.8] 70.2 [59.1, 79.4] 37.2 [31.2, 42.4] < 0.001
  1. Demographic data including age, height, weight, and BMI were assessed with one-way analysis of variance. Sex distribution was evaluated with Fisher’s exact test. Each pulmonary functional data was examined with one-way analysis of variance on ranks. BMI Body mass index, COPD Chronic obstructive pulmonary disease, FEV1 Forced expiratory volume in one second; FEV1% Forced expiratory volume percent in one second divided by forced vital capacity, %FEV1 Percent predicted forced expiratory volume in one second; GOLD Global initiative for chronic obstructive lung disease; IQR Interquartile range, PFT Pulmonary function tests; TV Tidal volume, VC Vital capacity, %VC Percent predicted vital capacity