PON1 and fetal growth restriction: The estriol (P < 0.001), estradiol (P = 0.007), and progesterone (P = 0.007) levels of the placental tissues and serum PON1 (P = 0.025) were different significantly between normal pregnant group, preeclamptic group without IUGR, preeclamptic group with IUGR (Tables 5 and 6).