Table 3– Spirometry and prevalence of airflow obstruction and other respiratory disease in never-smokers
VariableFemalesMales
Subjects n287 15330 246
FEV1 L2.00±0.482.62±0.68
FEV1 % of predicted#88.4±16.986.8±17.6
FVC L2.36±0.543.06±0.75
FVC % of predicted#86.2±16.682.4±16.7
FEV1/FVC85.0±7.885.5±8.9
FEV1/FVC <0.711 473 (4.0)1540 (5.1)
FEV1/FVC <0.7 and FEV1 <80% predicted+9033 (3.1)1292 (4.3)
FEV1/FVC <LLN#16 906 (5.9)1585 (5.2)
Ever diagnosed with chronic bronchitis/emphysema6064 (2.1)962 (3.2)
Ever diagnosed with asthma1477 (0.5)242 (0.8)
Ever diagnosed with tuberculosis3134 (1.1)780 (2.6)
  • Data are presented as mean±sd or n (%), unless otherwise stated. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; LLN: lower limit of normal. #: predicted values of FEV1, FVC and the LLN of FEV1/FVC were calculated with Global Lung Function Initiative reference equations; : Global Initiative for Chronic Obstructive Pulmonary Disease (GOLD) grade ≥1; +: GOLD ≥2.