Table 1—

Patient characteristics

Non-smokersSmokers without emphysemaSmokers with emphysema
Subjects n6510
Age yr65±967±1065±8
Sex M/F1/53/29/1
Pack-yrs29±1447±15
FEV1% pred99.2±15.198.9±17.777.6±21.9
FRC% pred94.8±15.9108.6±26.7122.7±25.2
  • Data presented as mean±sd

  • M: male

  • F: female

  • FEV1: forced expiratory volume in one second

  • FRC: forced residual capacity