Table 1.
Group I, TDI-induced asthma; Group II, asymptomatic exposed controls; Group III, allergic asthma; Group IV, normal controls. NA not applicaple, All values are presented as mean ± SD; PC20 Mch; methacholine dose at the time of a 20% fall in FEV1 was observed.
*p = 0.01, †p < 0.05, significant differences in mean IgG levels between subjects with TDI-induced asthma and the other three groups.