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Table 1 Baseline characteristics of the study population

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

  N = 48
Sex, female, (%) 4 (8.3)
Age, years 77 (71–81)
Smoking index, pack-years 50.0 (30.0–76.9)
Current smokers, (%) 2.0 (4.2)
BMI, kg/m2 23.4 ± 3.2
FEV1/FVC, (%) 51.7 (43.9–61.4)
%FEV1, (%) 69.8 ± 19.1
COPD grades* 1/2/3/4, (%) 14/27/6/1 (29.2/56.3/12.5/2.0)
  1. Data are presented as mean ± SD, medians (IQR), or number (%). * Defined by the Global Initiative for Chronic Obstructive Lung Disease. BMI, body mass index; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; %FEV1, forced expiratory volume in 1 s as a percentage of predicted forced expiratory volume in 1 s; COPD, chronic obstructive pulmonary disease; GOLD, Global Initiative for Chronic Obstructive Lung Disease