Fig. 2From: Evaluation of the association between maternal folic acid supplementation and the risk of congenital heart disease: a systematic review and meta-analysisPossible association between maternal FA supplementation and CHD. FA: folic acid; CHD: congenital heart disease; A. Odd ratio (OR) estimates for the overall association of maternal FA supplementation with the risk of CHD; B. OR estimates for the association between maternal FA supplement intake and CHD; C. OR estimates for the association between the initiation of FA supplementation on CHDs; D. Estimated OR of the association between FA supplementation time and CHDBack to article page