Table 1—

Subject characteristics, lung function and pixel indices

NMedianIQR
Gender M:F74:37nana
Age yrs1115043–55
Lung function
 FEV111141.729.2–76.2
 FEV1/VC11143.929.7–71.7
 FEF25%–75%10514.09.6–36.2
sGaw9933.319.7–49.8
 TLC109119.1105.3–132
 RV109135.7101.3–169.1
 RV/TLC109115.893.4–137.6
TL,CO10961.050.0–85.0
KCO10967.451.3–90.4
P a,O2 999.28.4–10.3
HRCT pixel index % pixels <−910 HU
 Upper zone inspiratory11135.319.7–49.8
 Upper zone expiratory11122.06.8–39.7
 Lower zone inspiratory11153.031.5–63
 Lower zone expiratory11144.420.6–56.2
  • N: number of patients

  • IQR: interquartile range

  • FEV1: Forced expiratory volume in one second

  • VC: vital capacity

  • FEF25%–75%: Forced midexpiratory flows

  • sGaw: specific airways conductance

  • TLC: total lung capacity

  • RV: residual volume

  • postbronchodilator values (where available, see methods) expressed as % predicted