Fig. 2From: Toxic metal mixtures in private well water and increased risk for preterm birth in North CarolinaForest plots of aORs for PTB based on tract-level exceedances of standards in private wells. Models were fit comparing individuals in tracts in which at or over 25% of well water tests reported concentrations above the EPA MCL. Models were adjusted for smoking, age, race/ethnicity, education, season of conception, tract-level poverty, tract-level nitrates and nitritesBack to article page