Table 2

Demographic information of first visit patients with normal spirometry but abnormal gas transfer

Male:female2809:2047
MeanSD
Age (years)67.113.2
FEV1 SR1.181.23
FVC SR1.721.40
FEV1/FVC SR0.320.64
TLCOc SR−3.121.24
KCOc SR−2.141.28
  • Lung function results are presented as standardised residual (SR).

  • FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; KCOc, transfer coefficient of the lung for carbon monoxide corrected; TLCOc, transfer for carbon monoxide corrected.