G6PD and G6PD deficiency: When comparing the recurrence rates between patients with normal G6PD and those with G6PD deficiency and considering them as a proxy for daily versus weekly PQ treatment, 20 of 122 patients (16.4%) who were taking PQ weekly had recurrence within 180 days compared with 265 of 1,322 patients (20.0%) who were taking PQ daily (risk ratio: 0.62, 95% confidence interval: 0.41-0.94, using a model adjusted for the study site.