[Association between maternal periconceptional supplementation of folic acid or multiple micronutrients containing folic acid and perinatal mortality rate].

The overall perinatal mortality rate was lower than the national average level in Tongzhou District of Beijing. Maternal periconceptional supplementation of pure folic acid or micronutrients containing folic acid had no impact on perinatal mortality. The association between maternal periconceptional supplementation of multiple micronutrients containing folic acid and perinatal mortality rate need further research.