Table 2

Mean (SE) methacholine reactivity in normal and asthmatic subjects following inhalation of ozone (200 ppb) or air

AirOzone
Baseline4 hours24 hoursBaseline4 hours24 hours
Normal1.70 (0.06)1.77 (0.03)1.68 (0.08)1.69 (0.07)1.63 (0.10)1.76 (0.03)
Asthmatic0.30 (0.21)0.28 (0.19)0.45 (0.19)0.38 (0.18)0.62 (0.18)0.41 (0.20)
  • Values are log10 dose of methacholine causing a 20% fall in FEV1.