Table 1 Subject demographics. Data are presented as mean ± SEM except for PC₂₀ methacholine which are presented as the geometric means.

Number:

31

17

Gender:

17 M/14 F

12 M/5 F

Age (yr): (range)

29.6 ± 1.3 (20 – 47)

27.1 ± 1.3 (21 – 33)

P = 0.22

Ragweed Skin Tests

Positive

Negative

FEV ₁ (L):

3.33 ± 0.2

4.06 ± 0.2

P = 0.005

FEV ₁ (% predicted):

84.8 ± 6

101.3 ± 3.7

P = 0.07

PC ₂₀ Methacholine (mg/ml):

1.0 ± 0.8

16 at > 32 mg/ml

1 at 11 mg/ml

Serum IgE (IU/ml):

177 ± 1

51 ± 13

P = 0.002