GSTM1 and Splenomegaly: Significantly lower mean D0 Hb concentrations (Table 2) were found in: (i) vivax-infected Papuans vs. non-Papuans, (ii) all patients with splenomegaly (n?=?47): 12.16 vs. 13.01 g/dL (without splenomegaly, n?=?105): ∆?=?−0.85 (−1.6 – –0.085), P?=?0.029, and (iii) all females (n?=?14) 10.18 vs. 13.01 g/dL (males, n?=?138): [∆?=?−2.82 (−3.97 – –1.67), P?<?0.0001.