Table 1 Mean FEV1%/FVC and FEV1 values from 28 authors and from the study of Albers and colleagues1
FEV1/FVC (%)FEV1 (l)
Age (year)4348Decline4348Decline
Mean80.279.21.03.4863.3500.135
Range73.8–84.172.4–83.50.4–1.63.10–3.822.95–3.660.11–0.16
Mean184.579.35.23.5323.3350.197
SD19.88.80.8330.806
  • FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.