However, in multivariate analysis, salivary ORAC (OR = 1.485, CI: 1.081-2.041, p = 0.015) and interaction between salivary ORAC and ALDH1 (OR = 0.829, CI: 0.700-0.983, p = 0.031) were the only independent factors in determining IUGR. The gene discussed is ALDH1A1; the disease is fetal growth restriction.