GSTM1 and parasitic infectious disease: When we stratified data by high and low reactivity relative to the median value, children group with low (below median) IgG reactivity against PF11_0521 DBLβ3_D4 domain had higher parasitemia (PE) (44,000 vs 12,000 parasites per microliter, not statistically significant) and lower Hb (P = 0.015 by t-test, as both groups of data were distributed normally) compared to group with high (above median) IgG.