IGHE and Eczematoid dermatitis: Retesting the RERI while examining interactions between any seroatopy (i.e., using total IgE as a continuous variable) and higher MBzP concentration in predicting eczema found a slightly greater than additive effect of MBzP and log total IgE at 60 months of age (RR log total IgE 1.18; RR IQR MBzP 1.46; joint RR 1.72; RERI: 0.07; 95% CI: 0.01, 0.46; n = 295).