Table 1.

Comparison of demographic characteristics and spirometry of the asthma group and the control group

Data are presented as mean±SD. n, number; M, male; F, female; FEV₁, forced expiratory volume in one second; % pred, percent of predicted value; BDR, bronchodilator response; PC₂₀, provocative concentration of methacholine causing FEV₁ to fall by 20%.