Table 3

Values for the lower limits of normal

SexMaleMaleFemale
Age (years)307070
Height (m)1.801.801.55
LLN as % pred80% pred as centileLLN as % pred80% pred as centileLLN as % pred80% pred as centile
FEV181474106518
FVC8147686724
FEV1/FVC861842862
PEF8057697219
FRC711374116820
RV621975107017
TLC8428427810
RV/TLC6517787786
TLco8147597018
Kco75966177912
  • Showing the LLN when expressed as per cent of predicted (pred) and 80% of predicted when expressed as population centile for a range of lung function indices for three different subjects.

  • Source: Professor MR Miller.

  • FEV1, forced expiratory volume in 1 s; FRC, functional residual capacity; FVC, forced vital capacity; Kco, gas transfer coefficient for carbon monoxide; LLN, lower limit of normal; PEF, peak expiratory flow; RV, residual volume; TLC, total lung capacity; TLco, carbon monoxide transfer factor.