Fig. 2From: The impact of IgG subclass deficiency on the risk of mortality in hospitalized patients with COPDKaplan–Meier survival curves for mortality according to IgG subclass deficiency (a) IgG1 deficiency; (b) IgG2 deficiency; (c) IgG3 deficiency; (d) IgG4 deficiency. IgG immunoglobulin GBack to article page