GSTM1 and anemia: Anaemia (defined as Hb < 10 g/dL) was present at baseline in 4 individuals in the primaquine arm and 3 participants in the no primaquine arm, and emerged during follow-up in 6/66 (9.1%) in the primaquine arm and 11/67 (16.4%) in the no primaquine arm (p = 0.21).