For most of the atopic or allergic conditions assessed, we observed a higher prevalence among G6PD deficient individuals than in the control group (Table 2), notably for allergic conjunctivitis (OR 1.25, 95% CI 1.15 to 1.36, P<.001), allergy to food/unspecified (OR 1.23, 95% CI 1.15 to 1.32, P<.001), contact dermatitis (OR 1.19, 95% CI 1.15 to 1.32, P<.001) and allergic urticaria (OR 1.14, 95% CI 1.04 to 1.24, P<.001). This evidence concerns the gene G6PD and allergic urticaria.