Table 2 Spirometry results and COPD (n= 95)

FEV₁, L

2.1 (1.7, 2.6)

 FEV₁ ≥ 80% of predicted

36 (38%)

 FEV₁ 50–79% of predicted

47 (49%)

 FEV₁ 30–49% of predicted

12 (13%)

 FEV₁ < 30% of predicted

0 (0%)

FEV₁ percent predicted

74.9 (62.4, 88.9)

FVC, L

2.9 (2.4, 3.3)

FVC percent predicted

81.9 (69.0, 89.8)

FEV₁/FVC ratio

0.78 (0.70, 0.83)

FEV₁/FVC ratio percent predicted

93.5 (84.1, 101.7)

FEV₁/FVC < LLN

29 (31%)

FEV₁/FVC < 0.70 (COPD)

22 (23%)

 FEV₁ ≥ 80% of predicted

0 (0%)

 FEV₁ 50–79% of predicted

12 (55%)

 FEV₁ 30–49% of predicted

10 (45%)

 FEV₁ < 30% of predicted

0 (0%)