MAOB and allergic asthma: Table 3 shows no significant differences in platelet 5-HT concentration and platelet MAO-B activity between asthma patients with T2-high and T2-low phenotypes, eosinophilic and non-eosinophilic asthma, or with and without AERD. In addition, only a nominally significant difference (p = 0.047) was observed in the platelet MAO-B activity but not in the platelet 5-HT concentration between non-allergic and allergic asthma patients (Table 3).