Prenatal coexposure to metals among children with atopic dermatitis at age 4 years. Adjusted for sex, maternal educational level, presence of parental allergies, exposure to tobacco smoke at age 4 years, and geographic area. The odds ratio for the risk of atopic dermatitis per unit increase in the derived weighted quantile sum (WQS) index of prenatal metal exposure was 1.63 (95% CI, 1.28-2.07). The solid blue line represents the boundary of the selection threshold. As indicates arsenic; Cd, cadmium; Co, cobalt; Cu, copper; Ni, nickel; Pb, lead; Tl, thallium; and Zn, zinc.