Table 2—

Clinical characteristics of control subjects

Subject no.AgeSexSmoking habitsAllergy/atopyFEV1 % predPD20 µg
138MONone90.3>2340
225MONone101.8>2340
321FC#None95.1>2340
428MCNone99.4>2340
526FNoneNone103.6>2340
623FNoneNone113.1>2340
724FNoneNone102.2>2340
  • FEV1: forced expiratory volume in one second

  • PD20: provocation dose causing a 20% fall in FEV1

  • M: male

  • F: female

  • O: occasional smoker

  • C: current smoker

  • #: 10

  • and ·: 15 cigarettesday−1