Haemoglobin concentration (g/dL) on day 3 after treatment in relation to G6PD status and parasite density at enrolment.

*Estimate of b-a, representing the interaction between G6PD status and treatment, is −0.04 g/dL, 95%CI −0.78 to +0.69, P = 0.907. If the heterozygous girls are excluded, (comparison c-a) the estimate is 0.21 g/dL (−1.1 to 1.5) P = 0.755. Estimate of e-d representing the interaction between treatment group and parasite density group is 0.41 g/dL (0.10 to 0.71) P = 0.009.