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Table 1 COPDGene study subjects

From: Paired inspiratory-expiratory chest CT scans to assess for small airways disease in COPD

  All subjects Severe emphysema‡ No emphysema§
N 8517 1188 5769
Age 59.6 (9.0) 65.5 (7.7) 57.6 (8.6)
Sex
Male 4535 (53.2%) 711 (59.8%) 2849 (49.4%)
Female 3982 (46.8%) 477 (40.2%) 2920 (50.6%)
Race
African American 2668 (31.3%) 190 (16.0%) 2156 (37.4%)
White 5849 (68.7%) 998 (84.0%) 3613 (62.6%)
Current smoking 4463 (52.4%) 259 (21.8%) 3547 (61.5%)
Pack-years of smoking 44.3 (24.8) 55.4 (27.8) 40.8 (22.6)
GOLD Stage [54 missing]† [3 missing]† [40 missing]†
0 3674 (43.4%) 17 (1.4%) 3241 (56.6%)
1 668 (7.9%) 47 (4.0%) 414 (7.2%)
2 1636 (19.3%) 263 (22.2%) 870 (15.2%)
3 965 (11.4%) 458 (38.7%) 217 (3.8%)
4 502 (5.9%) 396 (33.4%) 33 (0.6%)
Unclassified* 1018 (12.0%) 4 (0.3%) 954 (16.7%)
  1. Non-smokers were excluded. Mean (SD) or N (%) is shown.
  2. *Unclassified: FEV1 < 80% predicted with FEV1/FVC > 0.7.
  3. †GOLD Stage is missing in subjects whose spirometry failed quality control.
  4. ‡Severe emphysema defined by Insp-950HU > 15% ex-smokers, > 14% current smokers.
  5. §No emphysema defined by Insp-950HU < 5% ex-smokers, < 4% current smokers.