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Table 1 Baseline characteristics of subjects who showed a downward shift in FEV1/FVC category between their baseline and final visits

From: Lung function decline in relation to diagnostic criteria for airflow obstruction in respiratory symptomatic subjects

  Subgroup
  A (n = 390) B (n = 82) C (n = 239)
  LLN-Fixed- ? LLN-Fixed+ LLN-Fixed- ? LLN + Fixed+ LLN-Fixed + ? LLN + Fixed+
  Non-smokers
(n = 246)
Smokers
(n = 144)
Non-smokers
(n = 27)
Smokers
(n = 55)
Non-smokers
(n = 102)
Smokers
(n = 137)
Males, n (%) 133 (54) 65 (45) 14 (52) 16 (29) 80 (78) 79 (58)
Age, years (SD) 64.9 (11.0) 58.3 (9.3) 53.0 (10.3) 52.6 (9.1) 63.6 (9.2) 61.7 (9.0)
Baseline postbronchodilator FEV1/FVC (SD) 0.75 (0.04) 0.75 (0.04) 0.75 (0.05) 0.75 (0.05) 0.64 (0.04) 0.65 (0.04)
Baseline postbronchodilator FEV1, liters (SD) 2.33 (0.76) 2.33 (0.67) 2.28 (0.60) 2.10 (0.58) 2.22(0.68) 2.09 (0.66)
as % predicted* (SD) 78.0 (14.8) 76.8 (12.1) 72.8 (14.3) 71.6 (11.9) 68.8 (12.2) 67.6 (12.7)
  1. See Figure 2b for further illustration of subgroups
  2. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; LNN: lower limit of normal; SD: standard deviation
  3. * based on Swanney prediction equations [6]