BLL > 5 µg / dl was significantly related to children age 12 - 24 months (OR = 5.85; CI 95%; 3.15 - 10.85), school children (OR = 4.61; CI 95%; 2.67 - 7.99), children located in Binh Duong province (OR = 3.04; CI 95%; 1.63 - 5.68), using rainwater (OR = 2.36; CI 95%; 0.98 - 5.67) and children whose parents do metal recycling or melting at work (OR = 4.08; CI 95%; 0.94 - 17.64).